"In the end, the two most important world leaders at the first-ever U.N. Summit on Climate Change didn't say enough to satisfy supporters or quell critics."

"China laid out a plan to curb carbon emissions by 2020 and U.S. President Barack Obama called on all nations to act now to tackle global warming, as world leaders tried to inject momentum into climate change talks."

"The world leaders who are meeting at the United Nations to discuss climate change on Tuesday, are faced with an intricate challenge: building momentum for an international climate treaty at a time when global temperatures have been stable for a decade and may even drop in the next few years."

"The United States and Europe face a new health threat from a mosquito-borne disease far more unpleasant than the West Nile virus that swept into North America a decade ago, a U.S. expert said on Friday."

"Two-thirds of the world's major deltas, home to nearly half a billion people, are caught in the scissors of sinking land and rising seas, according to a study published Sunday."

"On Tuesday, the U.N. is holding a day-long Climate Summit (alongside its annual, two-week General Assembly) in New York City. And on Thursday and Friday, the Group of 20 (G20) leading world economies is gathering in Pittsburgh, its third meeting of the year to deal with the global economic meltdown."

Despite all the buzz surrounding nuclear power in Washington, a new study tallying the costs suggests nuclear's many uncertainties could push it out of the realm of being cost-competitive. Laura Shin reports for SolveClimate.

"Montpellier, France -- Pesticides, viruses, industrialised farming, fungus... what on Earth is killing our bees? That's the big question being asked at Apimondia, the 41st world apiculture congress, where 10,000 beekeepers, entomologists and other actors in the honey business are gathered in this southern French city until Sunday."