What is COP27? What you need to know about the U.N. climate summit.

Egyptian officer guards the International Congress Center ahead of COP27 in Sharm el-Sheikh, Egypt, on Friday. (Sedat Suna/EPA-EFE/Shutterstock)

Tens of thousands of people from around the globe will descend on Egypt starting Sunday for the annual United Nations climate change summit.

Here’s what to know:

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