2011 saw a record high in carbon dioxide emissions, with China’s contribution growing the most.

Climate change is a boon for one species, at least: The brown argus butterfly, previously rare, has been staking out more turf for itself as the areas north of its range become warmer and more hospitable.

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With the chair of the Nuclear Regulatory Commission on his way out, the president nominated Allison Macfarlane to take his place.

Negotiations for the Rio+20 summit are “painfully slow,” says U.N. Secretary General Ban Ki-Moon.

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There’s a growing gap between cars’ fuel economy rating and performance on the road.

Eating dirt is totally normal.