Climate Matters•September 22, 2014

Climate Week 2014

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For this week’s Climate Matters, we're stepping back from our usual analysis of weather and climate trends for an overall, big-picture look at how we really know that climate change is happening, and that our own emissions of greenhouse gases are a big part of the reason. We’ve also created our first-ever interactive quiz. You can test your knowledge about climate facts, share it online and see how you stack up against other people.