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Casey O'Brien

Plants & Animals

25 endangered animals that only live in America

Laysan duck in the water.

Environment

Can you solve these real 'Jeopardy!' clues about the oceans?

Environment

54 American cities with dangerous ozone conditions

View of the Los Angeles skyline surrounded by smog

Weather

Fastest-warming states in the US

Environment

The only 7 countries that are on track to meet the Paris Agreement—and how they're doing it