2015 was officially the hottest year on record, following a gradual rise in temperatures worldwide for over a century, according to The National Oceanic Atmospheric Administration and NASA.
They announced on Wednesday that 2015 was hottest year in 136 years of record keeping.
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The Hindu reports:
The NOAA said 2015’s temperature was 58.62°F (14.79°C), passing 2014 by a record margin of 0.29°F. That’s 1.62°F above the 20-century average. NASA, which measures differently, said 2015 was 0.23°F warmer than the record set in 2014.
Because of the wide margin over 2014, NASA calculated that 2015 was a record with 94 per cent certainty, about double the certainty it had last year when announcing 2014 as a record.
Although 2015 is now the hottest on record, it was the fourth time in 11 years that Earth broke annual marks for high temperature.
“It’s getting to the point where breaking record is the norm,” Texas Tech climate scientist Katharine Hayhoe said. “It’s almost unusual when we’re not breaking a record.”
Scientists blame a combination of El Nino and increasing man-made global warming.
Michael Mann of Pennsylvania State University said a strong El Nino, like this year’s, can add about a third of a degree of warming to Earth’s temperature.
“Records will happen during El Nino years due to the extra warming boost they provide,” Mr. Mann said in an email. “That boost of warmth however sits upon the ramp of global warming.”
And it’s likely to happen this year, too. NASA scientists and others said there’s a good chance that this year will pass 2015 as the hottest year on record, thanks to El Nino.
“2015 will be difficult to beat, but you say that almost every year and you get surprised,” said Victor Gensini, a meteorology professor at the College of DuPage outside of Chicago.
Measurements from Japan and the University of California at Berkeley also show 2015 is the warmest on record. Satellite measurements, which scientists say don’t measure where we live and have a larger margin of error, calculate that 2015 was only the third hottest since 1979.
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