Déjà Vu Again: Hot September Drives 2015 To Hottest Year On Record

by JOE ROMM – CREDIT: GLOBAL TEMPERATURES IN SEPTEMBER VS. 1951-1980 AVERAGE. VIA NASA. Once again, it’s the hottest year on record by far through last month, NASA reports. We’re running out of headlines for this repetitive monthly warm up, but with the recent death of the legendary Yogi Berra, one of his classic lines comes to mind, “It’s like deja-vu, all over again.” This was the hottest September by far in the dataset of the Japan Meteorological Agency, and second only to 2014 for hottest September in the NASA dataset. With the long-term warming trend caused by human activity boosted by the short-term warming caused by the strongest El Niño since the big one of 1997-1998 — and with the current month, October, trending very warm — it’s now a better than 99 percent chance 2015 will be the hottest calendar year on record. But the NASA data makes clear...

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