To coincide with today’s celebration, see how much you know about Earth Day and how climate change could threaten the planet’s future.
See which developed and developing countries have set carbon reduction pledges for 2020.
Get more details on the Earth’s recent rise in temperature.
Read more about how climate change threatens our country.
See what President Obama is doing in response to rising sea levels. Look at a stunning photo essay of the Arctic’s devastating transformation.
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