The U.S. Supreme Court heard its first case on global warming Wednesday, with 12 states asking the court to mandate limits on greenhouse emissions from new cars and trucks. Experts discuss the case and analyze its significance.
A natural gas boom in Wyoming has had both positive and negative impacts on a once small town.
A United Nations summit aimed at improving living conditions for the world's poor without damaging natural resources opened Monday in the South African capital of Johannesburg.
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