According to a recent analysis, the earth is at the possibility of entering a constant hothouse state — in which the global temperatures will rise by a few degrees even if goals under 2015 Paris climate deal are fulfilled. Presently, global average temperatures are just more than 1 degree Celsius over pre-industrial and increasing in 0.17 degree Celsius per decade. Maintaining global warming to over 1.5-2 degrees Celsius as agreed in 2015 Paris climate arrangement by around 200 countries might be more challenging than previously assessed. Human-induced global warming of 2 degrees Celsius may activate other Earth system processes often referred to as feedbacks that may induce further heating even if greenhouse gases emissions are ceased.

Earth at risk of becoming irreversible hothouse: Study

Preventing this situation will require redirection of human activities from manipulation to stewardship of Earth system. The analysis considers ten natural responses procedures, some of which are tipping elements that cause abrupt change if the critical threshold is crossed. These feedbacks can turn from being the buddy that stores carbon to the foe that emits it uncontrollably in a warmer world. These feedbacks include permafrost thaw, weakening land and ocean carbon dioxide, reduction of methane hydrates from the sea floor, raising bacterial respiration in oceans, boreal forest dieback, Amazon rainforest dieback, reduction of northern hemisphere snow cover, loss of Arctic summer sea ice and loss of Antarctic sea ice and polar ice sheets.

These feedbacks tipping elements could behave like a row of dominoes. Once one is pushed, it compels Earth towards another.