30 Jun '16, 10pm

Why a half-degree temperature rise is a big deal

The Paris Agreement, which delegates from 196 countries hammered out in December 2015, calls for holding the ongoing rise in global average temperature to “well below 2 °C above pre-industrial levels,” while “pursuing efforts to limit the temperature increase to 1.5 °C.” How much difference could that half-degree of wiggle room (or 0.9 degree on the Fahrenheit scale) possibly make in the real world? Quite a bit, it appears. The European Geosciences Union published a study in April 2016 that examined the impact of a 1.5 degree Celsius vs. a 2.0 C temperature increase by the end of the century, given what we know so far about how climate works. It found that the jump from 1.5 to 2 degrees—a third more of an increase—raises the impact by about that same fraction, very roughly, on most of the phenomena the study covered. Heat waves would last around a third longer, rain storms...

Full article: http://climate.nasa.gov/news/2458/why-a-half-degree-tempe...

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Why a half-degree global temperature rise is a ...

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The Paris Agreement, which delegates from 196 countries hammered out in December 2015, calls for holding the ongoing rise ...

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