https://www.vice.com/en_us/article/xwen83/were-about-to-cross-9-critical-climate-tipping-points-scientists-say

Nine crucial tipping points in Earth’s climate are now “active” and in danger of being crossed thanks to warming global temperatures caused by human activity, warn scientists in a commentary published on Wednesday in Nature.

These climate thresholds, such as the decline of ice sheets and loss of biodiverse habitats, could cumulatively trigger a global tipping point that would be “an existential threat to civilization,” cautioned the authors of the article.