2014 was the planet’s warmest year on record. Now, one year doesn’t make a trend, but this does: 14 of the 15 warmest years on record have all fallen in the first 15 years of this century.

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Quote text and notes from Wikiquote: Barack Obama (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.