5 things to know about the new UN report on climate change

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GENEVA – The U.N.-appointed Intergovernmental Panel on Climate Change published a new report Monday summarizing the latest authoritative scientific information about global warming. Here are five important takeaways.

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BLAMING HUMANS

The report says almost all of the warming that has occurred since pre-industrial times was caused by the release of heat-trapping gases such as carbon dioxide and methane. Much of that is the result of humans burning fossil fuels — coal, oil, wood and natural gas.

The authors say global temperatures have already risen by 1.1 degrees Celsius (2 degrees Fahrenheit) since the 19th century, reaching their highest in over 100,000 years, and only a fraction of that increase can have come from natural forces.

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PARIS GOALS

Almost all countries have signed up to the 2015 Paris climate accord, which aims to limit global warming to an increase of 2 degrees Celsius (3.6 Fahrenheit) above the pre-industrial average by the year 2100. The agreements says that ideally the increase would be no more than 1.5 degrees Celsius (2.7 degrees Fahrenheit).

But the report’s 200-plus authors looked at five scenarios and concluded that all will see the world cross the 1.5-degree threshold in the 2030s — sooner than in previous predictions. Three of those scenarios will also see temperatures rise 2 degrees Celsius.

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BIG CATCH

Although temperatures are expected to overshoot the 1.5-degree-Celsius target in the next decade, the report suggests that warming could be brought back down to this level through what are known as “negative emissions.” That means sucking more carbon dioxide out of the atmosphere than is added, effectively cooling the planet again. The panel said that could be done staring about halfway through this century but doesn’t explain how, and many scientists are skeptical it’s possible.

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