A climate apocalypse (also called a climate dystopia and a climate-induced collapse, among other names) generally denotes a predicted scenario involving the global collapse of human civilization and potential human extinction as either a direct or indirect result of anthropogenic climate change. Many academics and researchers posit that in actuality, unless a major course correction is imminently implemented, some or all of the Earth will be rendered uninhabitable as a result of extreme temperatures, severe weather events, an inability to grow crops, and an altered composition of the Earth's atmosphere.

In September 2021 more than 200 scholarly medical journals published an emergency call for action, saying that a temperature increase of 1.5 degrees would bring catastrophic harm to global health from which the world will never recover.

 

Note:   The above text is excerpted from the Wikipedia article Climate apocalypse, which has been released under the GNU Free Documentation License.