A Senate Environment Committee hearing on climate science Wednesday only exemplified the political deadlock that keeps the United States from basing policy on established science.

"The lines are now drawn on a political hot button in Iowa: a lucrative tax break for wind energy. Mitt Romney is against it, President Barack Obama favors it — opposing stances that could have political and economic implications in Iowa, which has more wind energy jobs than any other state in the nation."

"A Senate committee passed a bill on Tuesday authorizing the transportation secretary to bar U.S. airlines from complying with a European Union law that would require them to pay for carbon emissions on flights to and from Europe."

"In a speech to the Senate on Thursday, Senator Bernie Sanders (I-Vt.) addressed what he calls the 'major environmental crisis of our time,' and took aim at the 'myths' of Senator Jim Inhofe (R-Ok.) and other legislators who ignore or actively deny the existence of anthropogenic climate change."

"An environmental group launched ads Monday targeting three GOP lawmakers for failing to push for an extension of a tax credit for wind energy producers, charging them with killing green energy jobs."

"Last week the University of Texas provost announced he would re-examine a report by a UT professor that said fracking was safe for groundwater after the revelation that the professor pocketed hundreds of thousands of dollars from a Texas natural gas developer. It's the latest fusillade in the ongoing battle over the basic facts of fracking in America."

"RICHMOND, Va. -- When a team from the Nuclear Regulatory Commission meets with the public Thursday, the prickliest aspect of ending Virginia's 30-year ban on uranium mining will be up for discussion: processing the radioactive ore to create fuel for nuclear power plants."

"TransCanada, the company seeking to build the 1,700-mile Keystone XL pipeline from oil sands formations in Alberta to Gulf Coast refineries, received the final go-ahead from the federal government on Friday for the southern leg of the project."

"WASHINGTON -- The Agriculture Department says a statement on its website encouraging its employees not to eat meat on Mondays was made without proper clearance."