However, this is my favorite part of this article:
To see how far this process could go, look 55.5m years to the Palaeocene-Eocene Thermal Maximum, when a global temperature increase of 6C coincided with the release of about 5,000 gigatonnes of carbon into the atmosphere, both as CO2 and as methane from bogs and seabed sediments. Lush subtropical forests grew in polar regions, and sea levels rose to 100m higher than today. It appears that an initial warming pulse triggered other warming processes. Many scientists warn that this historical event may be analogous to the present: the warming caused by human emissions could propel us towards a similar hothouse Earth.I just want to point out that there were no humans, in the secular view, 55.5 million years ago -- so whatever caused the temperature spike then wasn't because of cars or campfires. And it seems to me that if what happened then is happening now, maybe we should think about what caused it then to understand what is allegedly causing it now.
Because shrill accusations that burning fossil fuels will cause a 4C global temperature spike when something prior to the formation of the fossil fuels we use today caused a 6C spike doesn't seem more reaonable: it seems desperate.