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billion worldwide fund highlighted during Monday's State of the Union speech was called both a landmark proposal and an outdated approach.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.
Climate concerns are pushing corporates to do good by doing well. Meanwhile, new research puts a number on the ecological impact of rich country lifestyles on poor ones.
Even as some states are mandating ethanol as part of the fuel mix, new research suggests that some biofuels are less ecofriendly than they seem.
A new report by Washington watchdog group Freedom House says a clampdown on political rights made 43 countries 'not free' in 2007.
Huge development around Moosehead Lake would create 500,000 tons of CO2 over 50 years, environmentalists say.
In 2008, expect developing nations to play a more active role in negotiations for the post-Kyoto Protocol period.
Lease sales could produce 15 billion barrels of oil, but environmentalists say drilling would threaten already melting habitat.
As the climate debate shifts away from the blame game, there's a growing interest in climate-action strategy.
Who would foreigners like to see at the helm of the world's superpower – a Republican or Democrat?