AGW is a driver in mass extinction events

[Billy_Bob]

You people are so damn predictable.... Not even empirical evidence calling you out liars stops the boy who cries wolf...

 

[Crick]

More than 1,100 mutilated dolphins have washed up on French beaches this year, victims of industrial net fisherman

1,100 mutilated dolphins have washed up on French beaches

 

[Crick]

View attachment 253168

You people are so damn predictable.... Not even empirical evidence calling you out liars stops the boy who cries wolf...

Show us some empirical evidence that proves I am a liar Billy.

 

[Crick]

Another study finding the radical warming led to an ocean without sufficient dissolved gases to support life.

Climate simulation of the latest Permian: Implications for mass extinction | Geology | GeoScienceWorld

Abstract
Life at the Permian-Triassic boundary (ca. 251 Ma) underwent the largest disruption in Earth's history. Paleoclimatic data indicate that Earth was significantly warmer than present and that much of the ocean was anoxic or euxinic for an extended period of time. We present results from the first fully coupled comprehensive climate model using paleogeography for this time period. The coupled climate system model simulates warm high-latitude surface air temperatures related to elevated carbon dioxide levels and a stagnate global ocean circulation in concert with paleodata indicating low oxygen levels at ocean depth. This is the first climate simulation that captures these observed features of this time period.

 

[Crick]

Another study showing a large "injection" of CO2 as the likely cause of not only the End Permian Extinction Event but a near total and synchronous transformation of marine and terrestrial ecologies afterwards

Smithian-Spathian boundary event: Evidence for global climatic change in the wake of the end-Permian biotic crisis | Geology | GeoScienceWorld

Abstract
One of the most important carbon cycle perturbations following the end-Permian mass extinction event straddles the Smithian-Spathian boundary (SSB) (Olenekian, Early Triassic). This anomaly is characterized by a prominent positive carbon isotope excursion known from Tethyan marine rocks. Its global significance is established here by a new high paleolatitude record (Spitsbergen). Paleontological evidence, such as Boreal palynological data (Barents Sea, Norway) and global patterns of ammonoid distribution, indicates a synchronous major change in terrestrial and marine ecosystems near the SSB. The reestablishment of highly diverse plant ecosystems, including the rise of woody gymnosperms and decline of the formerly dominating lycopods, is interpreted as an effect of a major climate change. This hypothesis is supported by modeling of ammonoid paleobiogeography, the distribution patterns of which are interpreted as a proxy for sea surface temperatures (SST). The latest Smithian thus appears to have been a time of a warm and equable climate as expressed by an almost flat pole to equator SST gradient. In contrast, the steep Spathian SST gradient suggests latitudinally differentiated climatic conditions. We propose that this drastic climate change and the global carbon cycle perturbation were triggered by a massive end-Smithian CO2 injection. The SSB event could therefore represent one of the causes for stepwise and delayed recovery of marine and terrestrial biotas in the wake of the end-Permian biotic crisis.

GeoRef Subject
C-13/C-12 Ammonoidea Cephalopoda carbon geochemistry Mesozoic microfossils OlenekianPlantae paleoclimatology palynomorphs Paleozoic paleoecology Upper Permian Arctic region Arctic Ocean Barents Sea climate change Triassic Invertebrata Mollusca isotope ratios Lower Triassicstable isotopes Smithian Spitsbergen pollen Svalbard Spathian isotopes miospores PermianPermian-Triassic boundary

 

[Crick]

Other studies, including this one from USGS Gas Hydrate Breakdown Unlikely to Cause Massive Greenhouse Gas Release indicate a low likelihood that methane hydrate dissociation could lead to a large methane release to the atmosphere under current conditions. However, the ocean just prior to the Jurassic ocean event, was nearly anoxic from increased temperatures.

Massive dissociation of gas hydrate during a Jurassic oceanic anoxic event

Massive dissociation of gas hydrate during a Jurassic oceanic anoxic event

Abstract
In the Jurassic period, the Early Toarcian oceanic anoxic event (about 183 million years ago) is associated with exceptionally high rates of organic-carbon burial, high palaeotemperatures and significant mass extinction1,2,3,4. Heavy carbon-isotope compositions in rocks and fossils of this age have been linked to the global burial of organic carbon, which is isotopically light. In contrast, examples of light carbon-isotope values from marine organic matter of Early Toarcian age have been explained principally in terms of localized upwelling of bottom water enriched in 12C versus 13C (refs 1,2,5,6). Here, however, we report carbon-isotope analyses of fossil wood which demonstrate that isotopically light carbon dominated all the upper oceanic, biospheric and atmospheric carbon reservoirs, and that this occurred despite the enhanced burial of organic carbon. We propose that—as has been suggested for the Late Palaeocene thermal maximum, some 55 million years ago7—the observed patterns were produced by voluminous and extremely rapid release of methane from gas hydrate contained in marine continental-margin sediments.

 

[foggedinn]

The most recent mass extinction was the Chicxulub Impact event, 66 million years ago. Homo Sapiens has been around for 200,000 years. Humans have not been through ANY mass extinctions.

Not really sure if mastodon, mammoth, cave bear, sabre tooth tiger, giant sloth, etc. counts as mass extinction event. We killed them to eat and to avoid being eaten

 

[Sun Devil 92]

The most recent mass extinction was the Chicxulub Impact event, 66 million years ago. Homo Sapiens has been around for 200,000 years. Humans have not been through ANY mass extinctions.

Thinning the herd might be a good thing.

Maybe you'll hook up with your ancestors whenever it happens.

 

[karpenter]

More than 1,100 mutilated dolphins have washed up on French beaches this year, victims of industrial net fisherman

1,100 mutilated dolphins have washed up on French beaches

But Not AGW ??

 

[CrusaderFrank]

More than 1,100 mutilated dolphins have washed up on French beaches this year, victims of industrial net fisherman

1,100 mutilated dolphins have washed up on French beaches

CO2 did that? Really!? Wow

Do you think this is like CO2 putting a horsehead in the bed, as a warning?

 

[CrusaderFrank]

Numerous studies have concluded that we are moving into the Earth's sixth mass extinction event. The cause are almost all anthropogenic: pollution, loss of habitat, global warming, disruption of predator/prey relationships, migratory changes, introduction of new diseases, etc.

This study finds that increased levels of anthropogenic global warming lead to increased number of species extinction events. Acting to mitigate AGW will limit the number of species lost.
Extinction risk from climate change
Abstract
Climate change over the past ∼30 years has produced numerous shifts in the distributions and abundances of species1,2 and has been implicated in one species-level extinction3. Using projections of species' distributions for future climate scenarios, we assess extinction risks for sample regions that cover some 20% of the Earth's terrestrial surface. Exploring three approaches in which the estimated probability of extinction shows a power-law relationship with geographical range size, we predict, on the basis of mid-range climate-warming scenarios for 2050, that 15–37% of species in our sample of regions and taxa will be ‘committed to extinction’. When the average of the three methods and two dispersal scenarios is taken, minimal climate-warming scenarios produce lower projections of species committed to extinction (∼18%) than mid-range (∼24%) and maximum-change (∼35%) scenarios. These estimates show the importance of rapid implementation of technologies to decrease greenhouse gas emissions and strategies for carbon sequestration.

As we saw from the OCO2 satellite, the main human contributors were China and rain forest fires. What's the plan to combat them?

 

[baileyn45]

Numerous studies have concluded that we are moving into the Earth's sixth mass extinction event. The cause are almost all anthropogenic: pollution, loss of habitat, global warming, disruption of predator/prey relationships, migratory changes, introduction of new diseases, etc.

This study finds that increased levels of anthropogenic global warming lead to increased number of species extinction events. Acting to mitigate AGW will limit the number of species lost.
Extinction risk from climate change
Abstract
Climate change over the past ∼30 years has produced numerous shifts in the distributions and abundances of species1,2 and has been implicated in one species-level extinction3. Using projections of species' distributions for future climate scenarios, we assess extinction risks for sample regions that cover some 20% of the Earth's terrestrial surface. Exploring three approaches in which the estimated probability of extinction shows a power-law relationship with geographical range size, we predict, on the basis of mid-range climate-warming scenarios for 2050, that 15–37% of species in our sample of regions and taxa will be ‘committed to extinction’. When the average of the three methods and two dispersal scenarios is taken, minimal climate-warming scenarios produce lower projections of species committed to extinction (∼18%) than mid-range (∼24%) and maximum-change (∼35%) scenarios. These estimates show the importance of rapid implementation of technologies to decrease greenhouse gas emissions and strategies for carbon sequestration.

The idea that a mass extinction could be driven by a 1.6C difference in temp is absurd. Agricultural runoff, deforestation are much more obvious culprits. Of course we are ignoring such things because CO2 is the only concern.

 

[mudwhistle]

Numerous studies have concluded that we are moving into the Earth's sixth mass extinction event. The cause are almost all anthropogenic: pollution, loss of habitat, global warming, disruption of predator/prey relationships, migratory changes, introduction of new diseases, etc.

This study finds that increased levels of anthropogenic global warming lead to increased number of species extinction events. Acting to mitigate AGW will limit the number of species lost.
Extinction risk from climate change
Abstract
Climate change over the past ∼30 years has produced numerous shifts in the distributions and abundances of species1,2 and has been implicated in one species-level extinction3. Using projections of species' distributions for future climate scenarios, we assess extinction risks for sample regions that cover some 20% of the Earth's terrestrial surface. Exploring three approaches in which the estimated probability of extinction shows a power-law relationship with geographical range size, we predict, on the basis of mid-range climate-warming scenarios for 2050, that 15–37% of species in our sample of regions and taxa will be ‘committed to extinction’. When the average of the three methods and two dispersal scenarios is taken, minimal climate-warming scenarios produce lower projections of species committed to extinction (∼18%) than mid-range (∼24%) and maximum-change (∼35%) scenarios. These estimates show the importance of rapid implementation of technologies to decrease greenhouse gas emissions and strategies for carbon sequestration.

Is there some sort of Carbon Credit I can pay into that will offset this inevitable destruction???

 

[Crick]

Buy an electric vehicle. Ride a bike when you can. Conserve power at home and at work. Vote for political candidates who accept mainstream science and respond intelligently to threats to you and your offspring, like AGW.

 

[hjmick]

The most recent mass extinction was the Chicxulub Impact event, 66 million years ago. Homo Sapiens has been around for 200,000 years. Humans have not been through ANY mass extinctions.

Then your thread title is deceitful.

"AGW is a driver in mass extinction events"

You said "events". Plural.

Since there have been only five mass extinction events in the history of the planet, with the sixth one theoretically on the horizon, and never before have homo-sapiens experinced a mass extinction, AGW could only possibly pertain to the pending sixth.

 

[Manonthestreet]

 

[Crick]

It looks to me as if they damn near pegged it back in 1988.

On front line of climate change as Maldives fights rising seas

 

[flacaltenn]

The most recent mass extinction was the Chicxulub Impact event, 66 million years ago. Homo Sapiens has been around for 200,000 years. Humans have not been through ANY mass extinctions.

You're really confused by this conjecture of Mass Extinction being falsely associated with a mere ONE DEGREE Celsius observed warming.. This idea that climate thermodynamics is even remotely SIMILAR to the climate changes during FOUR MAJOR ICE AGES and thaws is ludicrous and phony as hell..

At the DEPTHS of each of those 4 glacial periods, there was NO CARBON CYCLE.. It was sequestered under miles of land and sea ice.. And at each of those fairly rapid (on geo time scales) thaws -- the AMOUNTS of CO2/Methane/Toxic gases were astronomically dangerous to any land or sea dwelling creature... Whether by "bursting" to the surface or just reducing habitat by swamp gas..

It's fairy tale to MAKE that comparison, because at the HEIGHT of each of those thaws -- like the one we live in now -- the amount of STILL sequestered CO2/Methane/Toxic gases is at their lowest point.. There's no danger of MASSIVE BURSTING of those reservoirs. The Gulf of Mexico will still bust up an occasional oil rig with a frozen methane bomb.. But THAT's the extent of it...

In fact, the RUSSIANS are sitting on the MAJORITY of still sequestered Carbon and THEIR GREATEST FEAR is NOT GW -- It's SEISMIC EVENTS... releasing all that carbon style gas...

Here comes the logic and reason -- cover your ears... If at the PEAK of those thaws, if CO2 had the superpowers that these modern theories attribute to this simple gas -- the THAWING AND HEATING WOULD HAVE NEVER STOP... Because there's plenty more tundra to melt or oceans to warm and release it...

Fact is -- there's a minimal amount left that is RELEASABLE by a couple degrees variance in the general surface temperature equilibrium.. And just like the negative feedbacks that STOP the thawing, the Carbon Cycle itself is not a linear Positive Feedback wrt surface Temps. It has a DECREASING effect as the rates of emission decrease and the sequestered material becomes harder to release.

If you can't calm yourself down, get a X-Anax prescription.. Because you're reading stuff that is purely speculation and gross modeling. NOT reality or fact or proven science....

 

[flacaltenn]

Conclusion of the Temperature Dependent Hypoxia article

CONCLUSION
Ocean warming and O2 loss simulated in an Earth System Model of end-Permian climate change imply widespread loss of aerobic habitat among animal types with diverse thermal and hypoxia tolerances. The resulting extinctions are predicted to select most strongly against higher-latitude species, whose biogeographic niche disappears globally. The combined physiological stresses of ocean warming and O2 loss largely account for the spatial pattern and magnitude of extinction observed in the fossil record of the “Great Dying.” These results highlight the future extinction risk arising from a depletion of the ocean’s aerobic capacity that is already under way.

OMG Squidward.. Calm the fuck DOWN... What were the atmos CO2 levels in the PERMIAN ERA?? AT LEAST 15 to 25 higher than TODAY.. Not a doubling -- which we haven't even reached yet since the Industrial Age began.. This is basic "speculation" and highly irresponsible to EVEN MENTION today's GW problem in the same breathe..

But science needs to get fed, and this study WOULD NOT HAVE gotten done if there weren't MOUNTAINS of govt money to spend on GW research.. They HAD to make that connection.. It was in their GRANT contract..

 

[flacaltenn]

More than 1,100 mutilated dolphins have washed up on French beaches this year, victims of industrial net fisherman

1,100 mutilated dolphins have washed up on French beaches

That's a REAL enviro problem.. Maybe you should FOCUS on the REAL ones...