Risk of multiple tipping points should be triggering urgent action on climate change

http://www.eurekalert.org/pub_releases/2016-03/uoe-rom031816.php

PUBLIC RELEASE: 21-MAR-2016
Risk of multiple tipping points should be triggering urgent action on climate change
To avoid multiple climate tipping points, policy makers need to act now to stop global CO2 emissions by 2050 and meet the Paris Agreement's goal of limiting global warming to 1.5 °C above pre-industrial levels, a new study has said
UNIVERSITY OF EXETER

To avoid multiple climate tipping points, policy makers need to act now to stop global CO2 emissions by 2050 and meet the Paris Agreement's goal of limiting global warming to 1.5 °C above pre-industrial levels, a new study has said.

Pioneering new research, carried out by the Universities of Exeter, Zurich, Stanford and Chicago, shows that existing studies have massively under-valued the risk that ongoing carbon dioxide emissions pose of triggering damaging tipping points.

The collaborative study suggests that multiple interacting climate tipping points could be triggered this century if climate change isn't tackled - leading to irreversible economic damages worldwide.

Using a state-of-the-art model, the researchers studied the effects of five interacting tipping points on the global economy - including a collapse of the Atlantic overturning circulation, a shift to a more persistent El Nino regime, and a dieback of the Amazon rainforest.

The study showed that the possibility of triggering these future tipping points increased the present 'social cost of carbon' in the model by nearly eightfold - from US$15 per tonne of carbon dioxide emitted, to US$116/tCO2.

Furthermore, the model suggests that passing some tipping points increases the likelihood of other tipping points occurring to such an extent that the social cost of carbon would further increase abruptly.

•••••