James Cameron hung out at the deepest point in the ocean yesterday — and tweeted about it.

Dolphins that have been in living in the Gulf of Mexico have serious health problems — low body weight, liver and lung cancer — that scientists describe as “consistent with oil exposure.”

Obama’s promoting an “all-of-the-above” energy plan, but he hasn’t been mentioning coal as part of it.

The Sierra Club’s Michael Brune goes on the offensive against hydrofracking.

Demand for beef is driving deforestation in Paraguay.

The Navajo government could build a resort on one rim of the Grand Canyon.

Aerosmith’s embarking on a “Global Warming” comeback tour this summer.