How We Know What We Know About Our Changing Climate

When the weather changes daily, how do we really know that Earth's climate is changing? Here is the science behind the headlines - evidence from flowers, butterflies, birds, frogs, trees, glaciers and much more, gathered by scientists from all over the world, sometimes with assistance from young citizen-scientists. And here is what young people, and their families and teachers, can do to learn about climate change and take action.

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