Earth is at the risk of falling into irreversible greenhouse state, claims a new study

The feedbacks effects include permafrost thaw, loss of methane hydrates from the ocean floor, weakening land and ocean carbon sinks and increasing bacterial respiration in the oceans. They also include Amazon rainforest dieback, boreal forest dieback, reduction of northern hemisphere snow cover, loss of Arctic summer sea ice, and reduction of Antarctic sea ice and polar ice sheets.