Did carbon starvation kill off the megafauna?
https://wattsupwiththat.com/2017/05/20/official-climate-agenda-is-always-the-negative-side-never-fair-and-balanced/
on Williams
May 20, 2017 at 4:32 pm
Really Skeptical…At the depths of the last ice age, the CO2 was 180 ppmv. At that count, a lot of vegetation is stunted and at 150 ppmv, photosynthesis starts to completely shut down and a lot of higher plant/life forms on earth would become completely extinct. And this was only about 18,000 -20,000 years BP. In geological time, that is yesterday. In fact, 47 species of Mega Fauna went extinct during that period of the most recent ice age retreat. And it wasn’t due to over hunting by early humans, because Clovis culture also nearly went extinct. Some speculate that a bolide hit the ice sheet and caused extreme melting and burning of what little vegetation there was in the middle latitudes of the northern hemisphere, although there is much missing evidence for everything, including whether Lake Aggizi catastrophically drained quickly into the Atlantic or Arctic oceans, causing a decline in the Thermohaline circulation.
At any rate, we do know that about 12,900 YBP, the Younger Dryas Event causes a major cooling for 1000 years and CO2 was only starting to recover from those extremely low counts during the peak of the ice age. Dismissing CO2 as an important GHG required for the survival of life on earth is dangerous, because we had been at the lowest concentrations of CO2 in hundreds of million years, near life extinction levels. Increasing it a little, with very little absolute temperature increase, while enjoying the benefits of a greening world should be a celebration of success by human kind. Don’t mistake visible air pollution for what they want to now call ‘carbon pollution’. Can’t even get the name right…
geology.gsapubs.org
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