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Communities where people see and spend more time in nature have higher levels of cohesion.
Three years after we crossed the threshold, we may not drop below it again.
This Honduran activist is one tragic example of what it means to be on the front lines of environmental justice.
As Bernie Sanders' campaign pushes Hillary Clinton toward more progressive positions, the rest of the Democratic Party may follow.
Time is running out for the world's coral reefs.
Diane Burko traveled from pole to pole to research the geology of ice and glaciers.
Can "fish hackathons" really save the oceans?
The Delta 5 trial begins Monday in Washington.
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