Saving endangered species sometimes means knowing where they used to live — before scientists started studying them. For that, we need historical ecologists.

Lost in much of the coverage of the region’s water woes is the ecological crisis caused by prolonged drought, climate warming and development.

An upcoming project would change the flow of the Mississippi River and its sediment to make up for land the coast is losing due to climate change and sea-level rise.

These weasel-like small cats haven’t been documented in the country since 1986. A new study suggests it’s time to reintroduce them.

A massive new plastics plant will soon start operating in Pennsylvania, even as support grows for international limits on plastic production.

New research supports efforts to designate more land and water to save biodiversity and fight climate change — but we need to protect better, as well as more.

A rare “orchid of the falls” plant has been declared extinct after a hydroelectric dam destroyed its only habitat. Could others soon follow?

We know more than ever about the abundance of life in the soil. Now we have to step up to save it.

Despite their reputation as destructive pests, new research reveals that armadillos support dozens of other species — including, possibly, humans.

One man’s mission to remove trash from the polluted river in Baghdad has inspired a nationwide movement that shows how environmental efforts inspire peace.