Guest essay by Eric Worrall

Scientists are worried that in 100 years, the effect on global temperature might almost be measurable, if the USA pulls out of the Paris Agreement.

Scientists explain what will happen if Donald Trump pulls out of Paris climate change agreement

The Earth will get dangerously warm even sooner if the U.S pulls out of pledge to cut carbon dioxide pollution

Seth Borenstein Saturday 27 May 2017 22:48 BST

Earth is likely to hit more dangerous levels of warming even sooner if the US pulls back from its pledge to cut carbon dioxide pollution, scientists said. That’s because America contributes so much to rising temperatures.

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Calculations suggest it could result in emissions of up to 3 billion tonnes of additional carbon dioxide in the air a year. When it adds up year after year, scientists said that is enough to melt ice sheets faster, raise seas higher and trigger more extreme weather.

“If we lag, the noose tightens,” said Princeton University climate scientist Michael Oppenheimer, co-editor of the peer-reviewed journal Climatic Change.

One expert group ran a worst-case computer simulation of what would happen if the U.S. does not curb emissions, but other nations do meet their targets. It found that America would add as much as half a degree of warming (0.3 degrees Celsius) to the globe by the end of century.

Scientists are split on how reasonable and likely that scenario is.

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Another computer simulation team put the effect of the U.S. pulling out somewhere between 0.1 to 0.2 degrees Celsius (.18 to .36 degrees Fahrenheit).

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