My head has not exploded. Your statement is a subjective opinion, not an objective fact.
That is generally correct. And for more than five times the span of homo sapiens existence on this planet, it has not exceeded 300 ppm.
That is utter nonsense.
Researchers have provided evidence that over the past 400,000 years, carbon dioxide levels in the atmosphere have caused increases in global temperatures.
www.forbes.com
250,000 years ago, global CO2 levels were between 200 and 280 ppm.
CO2 has never gotten much beyond 2,000 ppm in the last 400 million years
Are you having a problem with the ppm scale?
Back then? A quarter of a million years ago when CO2 was roughly HALF its current level? No one was expecting the Earth to blow up in flames.
There were large mammals at that time, but your description is a significant exaggeration.
And how do farmers "pump in CO2"?
CO2 levels have NEVER gotten anywhere near 17,000 ppm. And if you look at the longer graph above, you will see that going from 2,200 ppm to 300 ppm took the better part of 100 million years. You're claim that it changed seven times that much in 1/400th the time in a geologically uneventful epoch is blatant ignorance.
We are a carbon-based life form but that has Zero-Zip-Nada to do with the effect of rapidly rising CO2 levels in our atmosphere due entirely to human GHG emissions and the effect THAT has on global temperatures.
I am so impressed. But what bearing does this have to do with atmospheric CO2 levels, the greenhouse effect, the rapid rise of temperatures, the melting of the polar ice caps and so forth?
The concentration of CO2 does not appear anywhere in your equation.
A pollutant is a harmful or dangerous contaminant. CO2 is toxic at high enough levels, but no one is suggesting that CO2 emissions be curtailed because of the compound's toxicity but it's participation in the greenhouse effect and the warming its increasing levels are causing.
I don't know where to start. Your claim was that CO2 was at 17,000 ppm 250,000 years ago. I am guessing you might have meant to say
1,700 ppm a quarter of a
billion years ago but it would have been completely reasonable to expect you to have caught that mistake the several times you repeated those figures. Thus the only possible conclusions is that you are intentionally misstating the facts (ie, lying) or that you are incredibly ignorant.
It's difficult to think you're making a simple mistake here. The first shell-bearing organisms appeared 520 million years ago.
Geologist Analyzes Earliest Shell-Covered Fossil Animals.
These were all marines species which took calcium carbonate out of the oceans. The carbonate can come from the atmosphere, but the calcium comes from rivers and coastal runoff.
Carbon dioxide in the atmosphere, when dissolved in the ocean, is much more likely to become CO2 + H2O -> H2CO3, carbonic acid. That reduces the ocean's pH, increases carbonate solubility and thus interferes with marine animals ability to fix carbonates for shell building.
I repeat, CO2 has not exceeded 300 ppm for the last 3 million years. Modern humans appeared 200,000 years ago.
You know, if you had listened to the USMB requirement that you post supporting links to claims of fact like the several you have made in this post, you might not have made so many blatant errors. Deserts have existed on this planet for at least the last 300 million years.
When was the first not-icy desert formed?.
The Antarctic continent was not located at the south pole and the current climate in the Sahara was created by the disappearance of the Tethys Sea. The movement of deserts around the planet has primarily been affected by plate tectonics.
And you know this how?
CO2 has been increasing since the Industrial Revolution began. If you're not happy with 410 ppm, just wait. And, you mention a paper but you provide no link. You have no links anywhere in a post for which USMB's rules demand several.
Wow. You've made so many factual errors in this post it's become hard not to believe it was all intentional and this whole thing was a troll. As the graph below shows, fifty years ago (1973), CO2 in the atmosphere was approaching 335 ppm. CO2 has not been down to 270 ppm at any time in the last 1,000 years.
The planet has been cooling for more than 5,000 years prior to the beginning of anthropogenic global warming about 1850. The growing alarm over global warming developed from increased understanding about what was happening and why. Predictions have been quite accurate.
Dr Hansen was completely correct.
That is NOT what is contained in that book. From Amazon's review:
The most important book yet from the author of the international bestseller The Shock Doctrine, a brilliant explanation of why the climate crisis challenges us to abandon the core “free market” ideology of our time, restructure the global economy, and remake our political systems.
In short, either we embrace radical change ourselves or radical changes will be visited upon our physical world. The status quo is no longer an option.
In This Changes Everything Naomi Klein argues that climate change isn’t just another issue to be neatly filed between taxes and health care. It’s an alarm that calls us to fix an economic system that is already failing us in many ways. Klein meticulously builds the case for how massively reducing our greenhouse emissions is our best chance to simultaneously reduce gaping inequalities, re-imagine our broken democracies, and rebuild our gutted local economies. She exposes the ideological desperation of the climate-change deniers, the messianic delusions of the would-be geoengineers, and the tragic defeatism of too many mainstream green initiatives. And she demonstrates precisely why the market has not—and cannot—fix the climate crisis but will instead make things worse, with ever more extreme and ecologically damaging extraction methods, accompanied by rampant disaster capitalism.
Klein argues that the changes to our relationship with nature and one another that are required to respond to the climate crisis humanely should not be viewed as grim penance, but rather as a kind of gift—a catalyst to transform broken economic and cultural priorities and to heal long-festering historical wounds. And she documents the inspiring movements that have already begun this process: communities that are not just refusing to be sites of further fossil fuel extraction but are building the next, regeneration-based economies right now.
Can we pull off these changes in time? Nothing is certain. Nothing except that climate change changes everything. And for a very brief time, the nature of that change is still up to us.
A new evaluation of global climate models used to project Earth's future global average surface temperature finds that most have been quite accurate.
climate.nasa.gov
Analysis of climate change modelling for past 15 years reveal accurate forecasts of rising global temperatures
www.theguardian.com
www.ipcc.ch
Latest IPCC climate report warns that rising greenhouse-gas emissions could soon outstrip the ability of many communities to adapt.
www.nature.com
View attachment 788326
From IPCC's AR6, "The Physical Science Basis", "Technical Summary"
And a similar but older diagram from Wikipedia that includes changes in solar irradiance.
"Without getting into the messiness of science...". Wow.
This thing's a troll, right. You couldn't make more mistakes if you tried.
Please provide us such a graph so we DON'T have to "imagine" it.
My god. You are either incredibly stupid or incredibly dishonest. I wish I'd read this post on Day 1.