A new report says there's more evidence than ever that humans are causing global warming. Here's a look at climate change by the numbers.
The United Nations has released a benchmark study on climate change that further strengthens the suspicions many scientists already have -- that humans are making the Earth warmer which, in turn, is having disastrous impacts on everything from weather to sea levels.
Keystone Resort/Ben Lindbloom
Jessica Rinaldi / Reuters
Pete Souza/White House Photo
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