"Some parts of nature and human society are more vulnerable than expected to climate change, according to a draft of a U.N. report that adds a new purple color to a key diagram to show worsening risks beyond the red used so far."

"This month, the Environmental Protection Agency will propose standards that will establish stricter pollution limits for gas-fired power plants than coal-fired power plants, according to individuals who were briefed on the matter but asked not to be identified because the rule was not public yet."

"MILWAUKEE -- Placing water retention structures in the St. Clair River may not be enough to counteract the effects of a warming climate and raise Lakes Huron and Michigan to their normal levels, experts said Monday."

"Publishers producing high school biology textbooks that could be used in classrooms across Texas are being pressured to water down lessons on evolution and climate change, a progressive watchdog group said Monday."

"As the State Department drags out the approval of the Keystone XL pipeline, it is more likely President Barack Obama's final decision on the project to help link Canada's oil sands to U.S. refineries will slip into 2014, experts said."

"If the 50 dirtiest power plants in the United States were their own sovereign country, they would qualify as the seventh-biggest polluter in the world, according to a new report released on Tuesday. Those power plants alone emit more than all of South Korea or Canada."

"This month, the world will get a new report from a United Nations panel about the science of climate change. Scientists will soon meet in Stockholm to put the finishing touches on the document, and behind the scenes, two big fights are brewing."

"MIAMI -- The 2013 Atlantic hurricane season, which forecasters had predicted would be more active than normal, has turned out to be something of a dud so far as an unusual calm hangs over the tropics."

"As the season heads into the historic peak for activity, it may even enter the record books as marking the quietest start to any Atlantic hurricane season in decades.

'It certainly looks like pretty much of a forecast bust,' said Jeff Masters, a hurricane expert and director of meteorology at the Weather Underground."

"ST. PETERSBURG -- Transcending their disagreements over Syrian chemical weapons, the G-20 leaders managed to reach agreement on confronting climate change in two ways. They will phase down refrigerant greenhouse gases and phase out inefficient fossil fuel subsidies."