The two superpowers – and super-emitters – recently put out a joint statement on climate change.

Despite increasing momentum toward a green energy shift, the world remains far off track from emissions reductions that will limit global temperature rise to 1.5 degrees Celsius, Biden’s climate ambassador said.

Of the big pledges so far at the UN climate conference, cutting methane could have the most immediate impact.

It's meant to stop something known as 'carbon leakage,' but the solution has economic, legal and environmental consequences.

Former Colorado Gov. Bill Ritter explains how the new administration can mobilize all parts of his government as it faces five big climate challenges.