"The largest, most sophisticated tornado chase ever assembled has been roaming the Great Plains for the past five weeks looking to crack some of the basic mysteries about the wildest storms on Earth."

"Henry Waxman’s climate change bill won’t make it into law this year. That’s why he’s the right guy for the job."

"Federal officials are struggling to calculate the fiscal impact that climate change could have on the nation's troubled public flood insurance program, amid predictions of intensifying downpours and more potent hurricanes."

"The Interior Department released a report today outlining flaws in the process used last year to auction oil and gas leases in Utah and calling for a comprehensive regional air-quality strategy and a review to decide whether to reinstate the parcels."

"Congress is all but abandoning President Barack Obama's goal of producing fully one-quarter of the nation's electricity from renewable sources -- wind, solar and the like -- by 2025, though a push for at least some increase is making headway."

"The world's richest countries and those that are developing fastest need to lead the transition to an energy-efficient and low-carbon economy to stave off the worst effects of climate change, science academies from these nations said on Thursday."

"The Obama administration said Thursday that it would toughen standards for mountaintop-removal coal mining but would not end the practice as some environmental groups had hoped."

"The World Health Organization declared an influenza pandemic on Thursday and called on governments to prepare for a long-term battle against an unstoppable flu virus."

"China will not accept binding cuts in its greenhouse gas emissions, an official said Thursday, after the United States said it made progress with Beijing in talks here on a global climate pact."