2016 was Earth's warmest year on record, continuing a three-year streak

Yahoo News - Last year was Earth's warmest on record since at least 1880, two federal agencies announced Wednesday.

With 2016 already bumping up against the 1.5-degree mark, it's clear that this target may be difficult, if not impossible, to adhere to.

"The window of time available for us to choose our future narrows with every year that goes by," said Katharine Hayhoe, a climate scientist at Texas Tech University, in an email.

"This record bears witness to the unprecedented experiment we are conducting with our planet: an experiment that puts us all at risk, the further we continue down this path."

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