World at Risk of Heading Toward Irreversible 'Hothouse' State

People take part in protests ahead of a G20 summit in Hamburg, Germany July 2, 2017. Placard reads "Global Warming is NOT a Myth". REUTERS/Hannibal Hanschke/File Photo

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reuters - by Nina Chestney - August 6, 2018

The world is at risk of entering “hothouse” conditions where global average temperatures will be 4-5 degrees Celsius higher even if emissions reduction targets under a global climate deal are met, scientists said in a study published on Monday . . .

 . . . Around 200 countries agreed in 2015 to limit temperature rise to “well below” 2C (3.6F) above pre-industrial levels, a threshold believed to be a tipping point for the climate.

However, it is not clear whether the world’s climate can be safely “parked” near 2C above pre-industrial levels or whether this might trigger other processes which drive further warming even if the world stops emitting greenhouse gases, the research said . . .

 . . . Scientists from the Stockholm Resilience Center, the University of Copenhagen, Australian National University and the Potsdam Institute for Climate Impact Research said it is likely that if a critical threshold is crossed, several tipping points will lead to abrupt change.

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