What border communities really need are solutions to address economic, health and climate problems — and the mesquite tree can help.

President Trump’s invocation of a national emergency to build his border wall is worrying and “illegal,” according to scholars.

A new book asks, “Can we feed the world without destroying it?” The answers might surprise you.

The unexpected announcement reverses a plan to move people out of critical protected habitats — and puts the nation’s amazing biodiversity at risk.

Researcher Emily Francis explains how the coast redwoods and sequoias fared during California’s drought and what that means for future climate resilience.

The removal of the Edwards Dam on Maine’s Kennebec River helped river conservationists reimagine what’s possible.