Methane levels in the atmosphere rose in 2007 after 10 years. Scientists are trying to find out why.
Eco-minded Scandinavians crave winter vacations. Yet the long flights add to greenhouse gases. Should they hit the beach or save the planet?
His call for US emissions to stabilize by 2025 marks a policy change, but is still behind other nations.
The president says the level will stabilize by that year, but he sets no cap.
Key question: Is air pollution from lower latitudes causing the region's recent warming?
A new study underscores the difficulty of estimating global warming's effect on weather.
Should the world put less focus on emissions caps and more on spurring clean technologies?
Scientists say the breakup is a harbinger of what's to come if the region continues warming.
Al Qaeda leader's taped message cites insulting cartoons for severe threat to Europe.
Rivers fed by melting glaciers across Latin America may soon dry up, forcing changes on the people who depend upon them.
In his 15 months as UN secretary-general, he has insisted that the UN come to embody two qualities not always associated with it: efficiency and responsiveness.
Some developing nations may be starting to sour on push by world powers to control lucrative nuclear technology.
The Canadian province of British Columbia hopes to change consumer behavior – and raise revenue – by taxing virtually all fossil fuels, including gasoline and home-heating fuel.
Investments in clean technology rises as companies find going green can be good for the bottom line.
A four-inch core sample is a chapter of ancient history in which a Neanderthal amoeba or a worm can thicken the plot for researchers.
Both leading Democrat and Republican candidates vie to show they can tackle global warming.
Bush's budget request Monday cut funding for renewable energy, but increased spending for science.
Secretary of State Rice arrives in London Wednesday to address tensions among key allies.
The $2 billion worldwide fund highlighted during Monday's State of the Union speech was called both a landmark proposal and an outdated approach.
At the meeting of the world's biggest polluters in Hawaii this week, host US has a chance to show it is serious about action on climate change.