Researchers say that climate change and overfishing have contributed to the massive decline in the world's marine life in the past 40 years.
Researchers predict rapid warming over the next couple years, matching record-breaking recent months.
The US Geological Survey is conducting a study of streams to determine how best to mitigate low snowpack in the country's western region.
President Obama is setting the US on a course toward producing much cleaner energy. Vermont offers a glimpse of that vision – and what the state needed to do to bring it about.
Healy, a 420-foot, 16,000-ton, 30,000-horsepower ship, that's capable of breaking more than 10 feet of ice, arrived at the North Pole one week ahead of schedule.
Less than 24 hours after Beijing hosted a much-awaited military parade under clear skies, the notoriously polluted city was as smoggy as ever.
Oil spills make a big splash on national news, but wastewater spills are a more common occurrence and can be harder to clean up.