Hundreds of activists formed a human chain outside one of the main plenary halls at the United Nations climate summit on what ...

Heads of state arrived in Rio de Janeiro on Sunday for the G20 summit and will spend Monday and Tuesday addressing issues from poverty and hunger to the reform of global institutions.

This year likely will end as warmest on record, and new findings show Earth's icy places are suffering. Meanwhile, CO2 ...

Donald Trump nominated Chris Wright to head the Department of Energy and personal lawyer Will Scharf as a White House staff ...