How does today's extreme heat compare with Earth's past climate?
Briefly

"In the timespan in which humans evolved and formed organised societies, today's global climate is unparalleled, being over 1C hotter than preindustrial levels."
"It's not like we will all become extinct, but we are messing with a thermostat that is pushing [us] outside a window we have been in during all of human civilisation."
Read at www.theguardian.com
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