Monthly Archives: December 2017

Climate change certainty

So how certain is climate change, really?

Turns out the global scientific community is a lot more certain than you might expect, given how much climate change gets denied in politics.

Here’s the basic run-down of what we know:

  • Global warming has been happening — and the evidence is unequivocal.
  • Human activities have definitely contributed to global warming.
  • It’s 95% certain that human activities have caused most of the global warming since 1950.
  • The best estimate is that human activities have caused all or nearly all of the global warming since 1950.

Or to sum up in a single sentence: Global warming is unequivocally happening, and humans have caused most — maybe all — of it.

Continue reading for details and citations.

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