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.

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

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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.