Member this FAKE NEWS? I member. Do you member?

[Wry Catcher]

You do realize the arctic has been ice free several times each inter-glacial cycle over the past 100 million years or so don't you? This is a natural cycle..

Back to thrashing the fake news called AGW.. Did the earths climate change over the 4.5 billion years or was it stagnate at today's levels?

Heres the problem with that concept. When climate changes over millions of years, life can adapt. For instance, Neanderthals were adapted to live in cold climates. When the climate changes too fast, then life doesn't adapt to live in it.

The current rate of change is not uncommon (different from) and not faster than that of the past changes... Your premise fails basic empirical evidence review..

Q. If Earth has warmed and cooled throughout history, what makes scientists think that humans are causing global warming now?


A. The first piece of evidence that the warming over the past few decades isn’t part of a natural cycle is how fast the change is happening. The biggest temperature swings our planet has experienced in the past million years are the ice ages. Based on a combination of paleoclimate data and models, scientists estimate that when ice ages have ended in the past, it has taken about 5,000 years for the planet to warm between 4 and 7 degrees Celsius. The warming of the past century—0.7 degrees Celsius—is roughly eight times faster than the ice-age-recovery warming on average.

The second reason that scientists think the current warming is not from natural influences is that, over the past century, scientists from all over the world have been collecting data on natural factors that influence climate—things like changes in the Sun’s brightness, major volcanic eruptions, and cycles such as El Niño and the Pacific Decadal Oscillation. These observations have failed to show any long-term changes that could fully account for the recent, rapid warming of Earth’s temperature.

Link: If Earth has warmed and cooled throughout history, what makes scientists think that humans are causing global warming now? : Climate Q&A : Blogs

 

[ding]

Some dumbasses make a big deal out of the rate at which temperature is rising relative to the rate it rose during the previous interglacial cycles. My answer to that is that it is not possible to make that comparison because we have many data points for the last 50 years but very few for the previous interglacial cycles.

For the red line below there are exactly two data points from the oxygen isotope curve which covers a time period of 6,957 years from 438,261 years ago to 431,304 years ago where the temperature rose by 8.3C. Some dumbasses don't seem to be able to comprehend that during those 6,957 years the slope of the temperature could have changed many times and that no one can tell you if during that time that there was ever a period of time where the slope was the same as today because the data does not exist. There were only 2 data points for this time period. But simpleton idiots will continue to argue that the slope from 438,261 years ago to 431,304 just had to be constant at 0.001 C/yr.

For the blue line below there are exactly two data points from the oxygen isotope curve which covers a time period of 7,950 years from 342,857 years ago to 334,907 years ago where the temperature rose by 12.4C. Some dumbasses don't seem to be able to comprehend that during those 7,950 years the slope of the temperature could have changed many times and that no one can tell you if that slope was the same as today because the data does not exist. There were only two data points for this time period. But simpleton idiots will continue to argue that the slope from 342,857 years ago to 334,907 just had to be constant at 0.002 C/yr.

For the orange line below there are exactly two data points from the oxygen isotope curve which covers a time period of 5,963 years from 252,422 years ago to 246,460 years ago where the temperature rose by 7.7C. Some dumbasses don't seem to be able to comprehend that during those 5,963 years the slope of the temperature could have changed many times and that no one can tell you if during that time that there was ever a period of time where the slope was the same as today because the data does not exist. There were only two data points for this time period. But simpleton idiots will continue to argue that the slope from 252,422 years ago to 246,460 years ago just had to be constant at 0.001 C/yr.

For the black line below there are exactly two data points from the oxygen isotope curve which covers a time period of 11,925 years from 143,106 years ago to 131,180 years ago where the temperature rose by 7.7C. Some dumbasses don't seem to be able to comprehend that during those 11,925 years the slope of the temperature could have changed many times and that no one can tell you if during that time that there was ever a period of time where the slope was the same as today because the data does not exist. There were only two data points for this time period. But simpleton idiots will continue to argue that the slope from 143,106 years ago to 131,180 years ago just had to be constant at 0.001 C/yr.

For the yellow line below there are exactly two data points from the oxygen isotope curve which covers a time period of 5,963 years from 18,876 years ago to 13,913 years ago where the temperature rose by 8.1C. Some dumbasses don't seem to be able to comprehend that during those 5,963 years the slope of the temperature could have changed many times and that no one can tell you if during that time that there was ever a period of time where the slope was the same as today because the data does not exist. There were only two data points for this time period. But simpleton idiots will continue to argue that the slope from 18,876 years ago to 13,913 years ago just had to be constant at 0.001 C/yr.

 

[ding]

Here is an example of what I am talking about using the data for the past 1500 years. We can see many points in the last 1500 years that the slope has been equal to or greater than what we are seeing today.

 

[ding]

You do realize the arctic has been ice free several times each inter-glacial cycle over the past 100 million years or so don't you? This is a natural cycle..

Back to thrashing the fake news called AGW.. Did the earths climate change over the 4.5 billion years or was it stagnate at today's levels?

Heres the problem with that concept. When climate changes over millions of years, life can adapt. For instance, Neanderthals were adapted to live in cold climates. When the climate changes too fast, then life doesn't adapt to live in it.

The current rate of change is not uncommon (different from) and not faster than that of the past changes... Your premise fails basic empirical evidence review..

Q. If Earth has warmed and cooled throughout history, what makes scientists think that humans are causing global warming now?


A. The first piece of evidence that the warming over the past few decades isn’t part of a natural cycle is how fast the change is happening. The biggest temperature swings our planet has experienced in the past million years are the ice ages. Based on a combination of paleoclimate data and models, scientists estimate that when ice ages have ended in the past, it has taken about 5,000 years for the planet to warm between 4 and 7 degrees Celsius. The warming of the past century—0.7 degrees Celsius—is roughly eight times faster than the ice-age-recovery warming on average.

The second reason that scientists think the current warming is not from natural influences is that, over the past century, scientists from all over the world have been collecting data on natural factors that influence climate—things like changes in the Sun’s brightness, major volcanic eruptions, and cycles such as El Niño and the Pacific Decadal Oscillation. These observations have failed to show any long-term changes that could fully account for the recent, rapid warming of Earth’s temperature.

Link: If Earth has warmed and cooled throughout history, what makes scientists think that humans are causing global warming now? : Climate Q&A : Blogs

If CO2 drives climate change, why did it take take 12 million years for the temperature to drop 7C when CO2 fell from 3500 ppm to 600 ppm?

 

[Wry Catcher]

You do realize the arctic has been ice free several times each inter-glacial cycle over the past 100 million years or so don't you? This is a natural cycle..

Back to thrashing the fake news called AGW.. Did the earths climate change over the 4.5 billion years or was it stagnate at today's levels?

Heres the problem with that concept. When climate changes over millions of years, life can adapt. For instance, Neanderthals were adapted to live in cold climates. When the climate changes too fast, then life doesn't adapt to live in it.

The current rate of change is not uncommon (different from) and not faster than that of the past changes... Your premise fails basic empirical evidence review..

Q. If Earth has warmed and cooled throughout history, what makes scientists think that humans are causing global warming now?


A. The first piece of evidence that the warming over the past few decades isn’t part of a natural cycle is how fast the change is happening. The biggest temperature swings our planet has experienced in the past million years are the ice ages. Based on a combination of paleoclimate data and models, scientists estimate that when ice ages have ended in the past, it has taken about 5,000 years for the planet to warm between 4 and 7 degrees Celsius. The warming of the past century—0.7 degrees Celsius—is roughly eight times faster than the ice-age-recovery warming on average.

The second reason that scientists think the current warming is not from natural influences is that, over the past century, scientists from all over the world have been collecting data on natural factors that influence climate—things like changes in the Sun’s brightness, major volcanic eruptions, and cycles such as El Niño and the Pacific Decadal Oscillation. These observations have failed to show any long-term changes that could fully account for the recent, rapid warming of Earth’s temperature.

Link: If Earth has warmed and cooled throughout history, what makes scientists think that humans are causing global warming now? : Climate Q&A : Blogs

If CO2 drives climate change, why did it take take 12 million years for the temperature to drop 7C when CO2 fell from 3500 ppm to 600 ppm?

I don't know, what I do know is the people with advanced degrees in science know a hell of a lot more about the subject than you, members of Congress and Trump know.

 

[ding]

You do realize the arctic has been ice free several times each inter-glacial cycle over the past 100 million years or so don't you? This is a natural cycle..

Back to thrashing the fake news called AGW.. Did the earths climate change over the 4.5 billion years or was it stagnate at today's levels?

Heres the problem with that concept. When climate changes over millions of years, life can adapt. For instance, Neanderthals were adapted to live in cold climates. When the climate changes too fast, then life doesn't adapt to live in it.

The current rate of change is not uncommon (different from) and not faster than that of the past changes... Your premise fails basic empirical evidence review..

Q. If Earth has warmed and cooled throughout history, what makes scientists think that humans are causing global warming now?


A. The first piece of evidence that the warming over the past few decades isn’t part of a natural cycle is how fast the change is happening. The biggest temperature swings our planet has experienced in the past million years are the ice ages. Based on a combination of paleoclimate data and models, scientists estimate that when ice ages have ended in the past, it has taken about 5,000 years for the planet to warm between 4 and 7 degrees Celsius. The warming of the past century—0.7 degrees Celsius—is roughly eight times faster than the ice-age-recovery warming on average.

The second reason that scientists think the current warming is not from natural influences is that, over the past century, scientists from all over the world have been collecting data on natural factors that influence climate—things like changes in the Sun’s brightness, major volcanic eruptions, and cycles such as El Niño and the Pacific Decadal Oscillation. These observations have failed to show any long-term changes that could fully account for the recent, rapid warming of Earth’s temperature.

Link: If Earth has warmed and cooled throughout history, what makes scientists think that humans are causing global warming now? : Climate Q&A : Blogs

If CO2 drives climate change, why did it take take 12 million years for the temperature to drop 7C when CO2 fell from 3500 ppm to 600 ppm?

I don't know, what I do know is the people with advanced degrees in science know a hell of a lot more about the subject than you, members of Congress and Trump know.

I see. So if CO2 drives climate change, how did we enter the glacial-interglacial cycles when CO2 was above 400 ppm?

 

[Old Rocks]

The last time carbon dioxide concentrations were around 400ppm: a snapshot from Arctic Siberia
Posted on 14 May 2013 by John Mason
Synopsis

During the late Pliocene and early Pleistocene Series of the Cenozoic Era, 3.6 to 2.2 Ma(million years ago), the Arctic was much warmer than it is at the present day (with summer temperatures from 3.6-3.4 Ma some 8oC warmer than today). That is a key finding of research into a lake-sediment core obtained in Eastern Siberia, which is of exceptional importance because it has provided the longest continuous late Cenozoic land-based sedimentary record thus far. The sedimentary sequence dates from recent times back to 3.6 Ma when the lake was formed by a large extraterrestrial impact. During the warm period, atmospheric carbon dioxide concentrations were close to those of today, at around 400 parts per million, indicative of a strong climate sensitivity signal in the Arctic, which has again warmed very rapidly in recent decades. The lake sediment record has thus provided us with a snapshot of how the Arctic may look in the near future.

The last time carbon dioxide concentrations were around 400ppm: a snapshot from Arctic Siberia

The development of ice sheets in the Southern Hemisphere around 34 million years ago seems fairly straightforward. The supercontinent of Gondwana broke apart, separating into subsections that became Africa, India, Australia, South America, and Antarctica. Passageways opened between these new continents, allowing oceans to flow between them.

When Antarctica was finally severed from the southern tip of South America to create the Drake Passage, Antarctica became completely surrounded by the Southern Ocean. The powerful Antarctic Circumpolar Current began to sweep all the way around the continent, effectively isolating Antarctica from most of the warmth from the global oceans and provoking large-scale cooling.

The Northern Hemisphere is more problematic. From sediment cores and other data, we know that until about 5 million years ago, North and South America were not connected. A huge gap—the Central American Seaway—allowed tropical water to flow between the Atlantic and Pacific Oceans.

A growing body of evidence suggests that the formation of the Isthmus of Panama partitioned the Atlantic and Pacific Oceans and fundamentally changed global ocean circulation. The closing of the Central American Seaway initially may have warmed Earth’s climate, but then set the stage for glaciation in the Northern Hemisphere at 2.7 million years ago.

How the Isthmus of Panama Put Ice in the Arctic

There you go. Many papers on this subject. If one does real research, rather than trying to find things that back their personal politics, you can learn a lot.

 

[ding]

The last time carbon dioxide concentrations were around 400ppm: a snapshot from Arctic Siberia
Posted on 14 May 2013 by John Mason
Synopsis

During the late Pliocene and early Pleistocene Series of the Cenozoic Era, 3.6 to 2.2 Ma(million years ago), the Arctic was much warmer than it is at the present day (with summer temperatures from 3.6-3.4 Ma some 8oC warmer than today). That is a key finding of research into a lake-sediment core obtained in Eastern Siberia, which is of exceptional importance because it has provided the longest continuous late Cenozoic land-based sedimentary record thus far. The sedimentary sequence dates from recent times back to 3.6 Ma when the lake was formed by a large extraterrestrial impact. During the warm period, atmospheric carbon dioxide concentrations were close to those of today, at around 400 parts per million, indicative of a strong climate sensitivity signal in the Arctic, which has again warmed very rapidly in recent decades. The lake sediment record has thus provided us with a snapshot of how the Arctic may look in the near future.

The last time carbon dioxide concentrations were around 400ppm: a snapshot from Arctic Siberia

The development of ice sheets in the Southern Hemisphere around 34 million years ago seems fairly straightforward. The supercontinent of Gondwana broke apart, separating into subsections that became Africa, India, Australia, South America, and Antarctica. Passageways opened between these new continents, allowing oceans to flow between them.

When Antarctica was finally severed from the southern tip of South America to create the Drake Passage, Antarctica became completely surrounded by the Southern Ocean. The powerful Antarctic Circumpolar Current began to sweep all the way around the continent, effectively isolating Antarctica from most of the warmth from the global oceans and provoking large-scale cooling.

The Northern Hemisphere is more problematic. From sediment cores and other data, we know that until about 5 million years ago, North and South America were not connected. A huge gap—the Central American Seaway—allowed tropical water to flow between the Atlantic and Pacific Oceans.

A growing body of evidence suggests that the formation of the Isthmus of Panama partitioned the Atlantic and Pacific Oceans and fundamentally changed global ocean circulation. The closing of the Central American Seaway initially may have warmed Earth’s climate, but then set the stage for glaciation in the Northern Hemisphere at 2.7 million years ago.

How the Isthmus of Panama Put Ice in the Arctic

There you go. Many papers on this subject. If one does real research, rather than trying to find things that back their personal politics, you can learn a lot.

Thanks for proving my point that CO2 does not drive climate change.

 

[ding]

The last time carbon dioxide concentrations were around 400ppm: a snapshot from Arctic Siberia
Posted on 14 May 2013 by John Mason
Synopsis

During the late Pliocene and early Pleistocene Series of the Cenozoic Era, 3.6 to 2.2 Ma(million years ago), the Arctic was much warmer than it is at the present day (with summer temperatures from 3.6-3.4 Ma some 8oC warmer than today). That is a key finding of research into a lake-sediment core obtained in Eastern Siberia, which is of exceptional importance because it has provided the longest continuous late Cenozoic land-based sedimentary record thus far. The sedimentary sequence dates from recent times back to 3.6 Ma when the lake was formed by a large extraterrestrial impact. During the warm period, atmospheric carbon dioxide concentrations were close to those of today, at around 400 parts per million, indicative of a strong climate sensitivity signal in the Arctic, which has again warmed very rapidly in recent decades. The lake sediment record has thus provided us with a snapshot of how the Arctic may look in the near future.

The last time carbon dioxide concentrations were around 400ppm: a snapshot from Arctic Siberia

The development of ice sheets in the Southern Hemisphere around 34 million years ago seems fairly straightforward. The supercontinent of Gondwana broke apart, separating into subsections that became Africa, India, Australia, South America, and Antarctica. Passageways opened between these new continents, allowing oceans to flow between them.

When Antarctica was finally severed from the southern tip of South America to create the Drake Passage, Antarctica became completely surrounded by the Southern Ocean. The powerful Antarctic Circumpolar Current began to sweep all the way around the continent, effectively isolating Antarctica from most of the warmth from the global oceans and provoking large-scale cooling.

The Northern Hemisphere is more problematic. From sediment cores and other data, we know that until about 5 million years ago, North and South America were not connected. A huge gap—the Central American Seaway—allowed tropical water to flow between the Atlantic and Pacific Oceans.

A growing body of evidence suggests that the formation of the Isthmus of Panama partitioned the Atlantic and Pacific Oceans and fundamentally changed global ocean circulation. The closing of the Central American Seaway initially may have warmed Earth’s climate, but then set the stage for glaciation in the Northern Hemisphere at 2.7 million years ago.

How the Isthmus of Panama Put Ice in the Arctic

There you go. Many papers on this subject. If one does real research, rather than trying to find things that back their personal politics, you can learn a lot.

Why did it take take 12 million years for the temperature to drop 7C when CO2 fell from 3500 ppm to 600 ppm?

 

[Old Rocks]

The last time carbon dioxide concentrations were around 400ppm: a snapshot from Arctic Siberia
Posted on 14 May 2013 by John Mason
Synopsis

During the late Pliocene and early Pleistocene Series of the Cenozoic Era, 3.6 to 2.2 Ma(million years ago), the Arctic was much warmer than it is at the present day (with summer temperatures from 3.6-3.4 Ma some 8oC warmer than today). That is a key finding of research into a lake-sediment core obtained in Eastern Siberia, which is of exceptional importance because it has provided the longest continuous late Cenozoic land-based sedimentary record thus far. The sedimentary sequence dates from recent times back to 3.6 Ma when the lake was formed by a large extraterrestrial impact. During the warm period, atmospheric carbon dioxide concentrations were close to those of today, at around 400 parts per million, indicative of a strong climate sensitivity signal in the Arctic, which has again warmed very rapidly in recent decades. The lake sediment record has thus provided us with a snapshot of how the Arctic may look in the near future.

The last time carbon dioxide concentrations were around 400ppm: a snapshot from Arctic Siberia

The development of ice sheets in the Southern Hemisphere around 34 million years ago seems fairly straightforward. The supercontinent of Gondwana broke apart, separating into subsections that became Africa, India, Australia, South America, and Antarctica. Passageways opened between these new continents, allowing oceans to flow between them.

When Antarctica was finally severed from the southern tip of South America to create the Drake Passage, Antarctica became completely surrounded by the Southern Ocean. The powerful Antarctic Circumpolar Current began to sweep all the way around the continent, effectively isolating Antarctica from most of the warmth from the global oceans and provoking large-scale cooling.

The Northern Hemisphere is more problematic. From sediment cores and other data, we know that until about 5 million years ago, North and South America were not connected. A huge gap—the Central American Seaway—allowed tropical water to flow between the Atlantic and Pacific Oceans.

A growing body of evidence suggests that the formation of the Isthmus of Panama partitioned the Atlantic and Pacific Oceans and fundamentally changed global ocean circulation. The closing of the Central American Seaway initially may have warmed Earth’s climate, but then set the stage for glaciation in the Northern Hemisphere at 2.7 million years ago.

How the Isthmus of Panama Put Ice in the Arctic

There you go. Many papers on this subject. If one does real research, rather than trying to find things that back their personal politics, you can learn a lot.

Thanks for proving my point that CO2 does not drive climate change.

What bullshit. The present climate change is being driven by GHGs. Yes, plate tectonics has much to do with the climate. As does GHGs. That is why whenever we see a spike in GHGs, we also saw a spike in temperature. Or when we saw a sudden drop in GHGs as at the end of the Oligocene, we saw a glacial period.

 

[ding]

The last time carbon dioxide concentrations were around 400ppm: a snapshot from Arctic Siberia
Posted on 14 May 2013 by John Mason
Synopsis

During the late Pliocene and early Pleistocene Series of the Cenozoic Era, 3.6 to 2.2 Ma(million years ago), the Arctic was much warmer than it is at the present day (with summer temperatures from 3.6-3.4 Ma some 8oC warmer than today). That is a key finding of research into a lake-sediment core obtained in Eastern Siberia, which is of exceptional importance because it has provided the longest continuous late Cenozoic land-based sedimentary record thus far. The sedimentary sequence dates from recent times back to 3.6 Ma when the lake was formed by a large extraterrestrial impact. During the warm period, atmospheric carbon dioxide concentrations were close to those of today, at around 400 parts per million, indicative of a strong climate sensitivity signal in the Arctic, which has again warmed very rapidly in recent decades. The lake sediment record has thus provided us with a snapshot of how the Arctic may look in the near future.

The last time carbon dioxide concentrations were around 400ppm: a snapshot from Arctic Siberia

The development of ice sheets in the Southern Hemisphere around 34 million years ago seems fairly straightforward. The supercontinent of Gondwana broke apart, separating into subsections that became Africa, India, Australia, South America, and Antarctica. Passageways opened between these new continents, allowing oceans to flow between them.

When Antarctica was finally severed from the southern tip of South America to create the Drake Passage, Antarctica became completely surrounded by the Southern Ocean. The powerful Antarctic Circumpolar Current began to sweep all the way around the continent, effectively isolating Antarctica from most of the warmth from the global oceans and provoking large-scale cooling.

The Northern Hemisphere is more problematic. From sediment cores and other data, we know that until about 5 million years ago, North and South America were not connected. A huge gap—the Central American Seaway—allowed tropical water to flow between the Atlantic and Pacific Oceans.

A growing body of evidence suggests that the formation of the Isthmus of Panama partitioned the Atlantic and Pacific Oceans and fundamentally changed global ocean circulation. The closing of the Central American Seaway initially may have warmed Earth’s climate, but then set the stage for glaciation in the Northern Hemisphere at 2.7 million years ago.

How the Isthmus of Panama Put Ice in the Arctic

There you go. Many papers on this subject. If one does real research, rather than trying to find things that back their personal politics, you can learn a lot.

Thanks for proving my point that CO2 does not drive climate change.

What bullshit. The present climate change is being driven by GHGs. Yes, plate tectonics has much to do with the climate. As does GHGs. That is why whenever we see a spike in GHGs, we also saw a spike in temperature. Or when we saw a sudden drop in GHGs as at the end of the Oligocene, we saw a glacial period.

Why did it take take 12 million years for the temperature to drop 7C when CO2 fell from 3500 ppm to 600 ppm?

 

[ding]

The last time carbon dioxide concentrations were around 400ppm: a snapshot from Arctic Siberia
Posted on 14 May 2013 by John Mason
Synopsis

During the late Pliocene and early Pleistocene Series of the Cenozoic Era, 3.6 to 2.2 Ma(million years ago), the Arctic was much warmer than it is at the present day (with summer temperatures from 3.6-3.4 Ma some 8oC warmer than today). That is a key finding of research into a lake-sediment core obtained in Eastern Siberia, which is of exceptional importance because it has provided the longest continuous late Cenozoic land-based sedimentary record thus far. The sedimentary sequence dates from recent times back to 3.6 Ma when the lake was formed by a large extraterrestrial impact. During the warm period, atmospheric carbon dioxide concentrations were close to those of today, at around 400 parts per million, indicative of a strong climate sensitivity signal in the Arctic, which has again warmed very rapidly in recent decades. The lake sediment record has thus provided us with a snapshot of how the Arctic may look in the near future.

The last time carbon dioxide concentrations were around 400ppm: a snapshot from Arctic Siberia

The development of ice sheets in the Southern Hemisphere around 34 million years ago seems fairly straightforward. The supercontinent of Gondwana broke apart, separating into subsections that became Africa, India, Australia, South America, and Antarctica. Passageways opened between these new continents, allowing oceans to flow between them.

When Antarctica was finally severed from the southern tip of South America to create the Drake Passage, Antarctica became completely surrounded by the Southern Ocean. The powerful Antarctic Circumpolar Current began to sweep all the way around the continent, effectively isolating Antarctica from most of the warmth from the global oceans and provoking large-scale cooling.

The Northern Hemisphere is more problematic. From sediment cores and other data, we know that until about 5 million years ago, North and South America were not connected. A huge gap—the Central American Seaway—allowed tropical water to flow between the Atlantic and Pacific Oceans.

A growing body of evidence suggests that the formation of the Isthmus of Panama partitioned the Atlantic and Pacific Oceans and fundamentally changed global ocean circulation. The closing of the Central American Seaway initially may have warmed Earth’s climate, but then set the stage for glaciation in the Northern Hemisphere at 2.7 million years ago.

How the Isthmus of Panama Put Ice in the Arctic

There you go. Many papers on this subject. If one does real research, rather than trying to find things that back their personal politics, you can learn a lot.

Thanks for proving my point that CO2 does not drive climate change.

What bullshit. The present climate change is being driven by GHGs. Yes, plate tectonics has much to do with the climate. As does GHGs. That is why whenever we see a spike in GHGs, we also saw a spike in temperature. Or when we saw a sudden drop in GHGs as at the end of the Oligocene, we saw a glacial period.

Why did we enter the glacial-interglacial cycles when CO2 was 400 ppm?

 

[Billy_Bob]

You do realize the arctic has been ice free several times each inter-glacial cycle over the past 100 million years or so don't you? This is a natural cycle..

Back to thrashing the fake news called AGW.. Did the earths climate change over the 4.5 billion years or was it stagnate at today's levels?

Heres the problem with that concept. When climate changes over millions of years, life can adapt. For instance, Neanderthals were adapted to live in cold climates. When the climate changes too fast, then life doesn't adapt to live in it.

The current rate of change is not uncommon (different from) and not faster than that of the past changes... Your premise fails basic empirical evidence review..

Q. If Earth has warmed and cooled throughout history, what makes scientists think that humans are causing global warming now?


A. The first piece of evidence that the warming over the past few decades isn’t part of a natural cycle is how fast the change is happening. The biggest temperature swings our planet has experienced in the past million years are the ice ages. Based on a combination of paleoclimate data and models, scientists estimate that when ice ages have ended in the past, it has taken about 5,000 years for the planet to warm between 4 and 7 degrees Celsius. The warming of the past century—0.7 degrees Celsius—is roughly eight times faster than the ice-age-recovery warming on average.

The second reason that scientists think the current warming is not from natural influences is that, over the past century, scientists from all over the world have been collecting data on natural factors that influence climate—things like changes in the Sun’s brightness, major volcanic eruptions, and cycles such as El Niño and the Pacific Decadal Oscillation. These observations have failed to show any long-term changes that could fully account for the recent, rapid warming of Earth’s temperature.

Link: If Earth has warmed and cooled throughout history, what makes scientists think that humans are causing global warming now? : Climate Q&A : Blogs

There is NO EMPIRICAL EVIDENCE TO SHOW IT IS HAPPENING FASTER.. Even the author of that blog agrees the spatial resolution is insufficient to prove his hypothesis..

 

[Crick]

What he admits is that the possibility exists that it could have happened as fast in the past - the chronological resolution is too wide to rule such a thing out. But what can be seen over and over and over again, are temperature deviation on the scale of 5-10 degrees that take tens of thousands of years or more to take place. That is the norm. Changes in CO2 levels, for instance, though larger in magnitude on several occasions, have always taken place far slower than we see today and the impact on ocean acidification was almost negligible due to the buffering produced by the weathering of limestone minerals on land. Such processes restrict rates of change for CO2 and temperature to values far, far slower than what we are seeing today.

 

[ding]

What he admits is that the possibility exists that it could have happened as fast in the past - the chronological resolution is too wide to rule such a thing out. But what can be seen over and over and over again, are temperature deviation on the scale of 5-10 degrees that take tens of thousands of years or more to take place. That is the norm. Changes in CO2 levels, for instance, though larger in magnitude on several occasions, have always taken place far slower than we see today and the impact on ocean acidification was almost negligible due to the buffering produced by the weathering of limestone minerals on land. Such processes restrict rates of change for CO2 and temperature to values far, far slower than what we are seeing today.

Your correlation is bullshit to say the least.

 

[Crick]

That buffering from aragonite erosion significantly reduces pH changes from slow increases in CO2 levels? You think that's bullshit?

 

[SSDD]

What bullshit. The present climate change is being driven by GHGs..

Can you provide even one single shred of observed, measured, quantified, empirical evidence to support that claim? Can you point to any actual measurements that strongly suggest a human fingerprint in climate vs natural variability?....can you point to anything in the climate at present that is even approaching the boundaries of natural variability?...and before you start claiming the speed of the temperature change...(same old flawed argument)...note that the first thing I am going to ask you is which proxy record has resolution fine enough to make claims for a period of 150, or even 200 years...kindly provide it if you have one.

 

[Crick]

www.ipcc.ch

 

[ding]

That buffering from aragonite erosion significantly reduces pH changes from slow increases in CO2 levels? You think that's bullshit?

Are you trying to change the subject because you have no answer? What happened to global warming due to CO2?

 

[Crick]

I was responding to your comment "Your correlation is bullshit to say the least.". Thus, if someone is attempting to change the topic, it would be you.