Modular classrooms -- cheap trailers, essentially -- may be an ideal solution when it comes to energy savings.

"Scientists are scrambling to get a handle on the levels of perfluorochemicals in treated municipal sewage sludge as further details emerge about the unexpected discovery of these compounds in fields near Decatur, Ala."

"Hoover Dam generates some of the power that lights Las Vegas all night long. But there's something that's making that job a bit more difficult."

"Legislation allowing more selenium to be released into Tennessee streams fell one vote short of passage Wednesday after lawmakers were told approval would mean poisoning the state's waters to help coal company win a lawsuit attacking its pollution."

"It could save the rainforests of Borneo, slow climate change and the international community backs it. But a plan to pay tropical countries not to chop down trees risks being discredited by opportunists even before it starts."

"A House committee began work Wednesday on a comprehensive overhaul of food safety rules that includes more inspections and new fees on producers to pay for them."

"Small Pacific islands vulnerable to rising sea levels won a symbolic victory at the United Nations on Wednesday with the passage of a resolution recognizing climate change as a possible threat to security."

"A Mexican proposal to raise billions of dollars to fight climate change is winning backing in talks on a new U.N. treaty, paradoxically because no one really likes it, a Mexican official said on Wednesday."

"The United States wants to forge a partnership with China, bringing the world's two biggest emitters of greenhouse gases together to address global warming, Washington's top climate diplomat said on Wednesday."

"A Raleigh County [WV] judge has issued a preliminary injunction to block anti-mountaintop removal activists from further peaceful protests on certain Massey Energy mining sites."