From New York to Shanghai, cities across the globe are swelling, compounding social and environmental sustainability challenges.

The race to find a solution to a rapidly warming world is one of the most pressing challenges facing our planet.

The ʻohiʻa is Hawaii’s iconic tree, a keystone species that maintains healthy watersheds and provides habitat for numerous endangered birds.

In the face of rising temperatures and worsening drought, the world’s repositories of agricultural seeds may hold the key to growing food under increasingly harsh conditions.

A study measuring the extent of coral bleaching in Australia's iconic Great Barrier Reef is branding some of the northern reef's problem as "extreme."

Gauging the trickle-down effects of high-level international policy is never easy.

The fate of a tree planted at poet Emily Dickinson's home raises questions about whether gardeners can — or should — play a role in helping plant species migrate ...

Surprising new statistics show that the world economy is expanding while global carbon emissions remain at the same level.

With new marine protected areas and an emerging U.N. treaty, global ocean conservation efforts are on the verge of a major advance.

The story of how Velcro came to be has become the stuff of legend.