"The Obama Administration has ignored wrenching climate impacts such as ocean acidification in its effort to estimate the cost of carbon emissions, making emissions limits disproportionately expensive, economists say."

"Almost 200 nations meet in Mexico this month to try to agree a "green fund" for poor countries and other steps toward an elusive climate treaty amid warnings that inaction is driving up the costs of tackling global warming."

"President Obama’s hopes of ratifying a new arms control treaty with Russia by the end of the year appeared to come undone on Tuesday as the chief Senate Republican negotiator moved to block a vote on the pact, one of the White House’s top foreign policy goals, in the lame-duck session of Congress."

"A federal grant program aimed at spurring investment in the U.S. solar industry expires at the end of this year, and its supporters are scrambling to get it extended in the lame-duck session of Congress that started this week."

"The panel named by President Obama to investigate the BP Deepwater Horizon blowout on Tuesday rejected a call by a consumer activist group for the resignation of its chief counsel, Fred H. Bartlit Jr. The group, Consumer Watchdog, said that the panel should dismiss Mr. Bartlit because his law firm, Bartlit Beck Herman Palenchar & Scott, once represented Halliburton, one of the companies involved in drilling the BP well."

"A far-reaching food safety bill that could give the government more power to prevent foodborne illnesses has become a target of advocates for buying food produced locally."

A new method of manipulating the genetic code of agricultural plants, known as targeted mutation, uses only genes that already exist in the plant. It may upend the debate over "genetic engineering."

"After Pittsburgh City Council gave final approval Tuesday to a ban on natural-gas production in the city, industry opponents vowed to press for similar prohibitions at the Allegheny County and state levels."