But even extreme global warming scenarios do not take us there, in any research I have seen. (reddit.com)
Human activities are releasing greenhouse gases more than 30 times faster than the rate of emissions that triggered a period of extreme global warming in the Earth's past, according to an expert on ancient climates. (realclimate.org)
(06/02/2013) Rainforests in South America have endured three previous extreme global warming events in the past, suggesting they will survive a projected 2 - 6 degree rise in temperatures over the coming century, reports a study published in the Annual Review of Earth and Planetary Science. (news.mongabay.com)