A Cal Fire firefighter battles the Camp Fire in 2018. Global warming makes deadly and destructive wildfires more likely.
Credit: Justin Sullivan (Getty

We know the planet is getting hot. Just how hot it will get is one of the biggest questions of the 21st century, tying up the fate of humanity and the biosphere in one neat hand basket to hell.

A 166-page study out today aims to help improve our understanding of how hot it will get by refining one of the most important metrics in climate science—what one researcher who worked on the paper dubbed the “holy grail” of research. The findings unfortunately show the best-case scenario is exceedingly unlikely, and heating will probably clock in on the higher end of previous estimates.

The metric scientists looked at in this massive paper, published Wednesday in Reviews of Geophysics, is something called climate sensitivity. It refers to how much the planet would heat up if we doubled the amount of carbon dioxide in the atmosphere compared to pre-industrial levels. That sounds like a simple thing to solve for, […]

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