Carbon dioxide levels in atmosphere surpass key milestone

Climate scientists say it's "like watching a train barrel down the track towards you in slow motion. It’s terrifying."

Hotter nights due to climate change will cost us sleep, study suggests

By the year 2099, hotter “suboptimal temperatures” may reduce sleep by 50 to 58 hours per person each year, according to a new study of adults from around the world.

Cleaner air leads to more hurricanes in the Atlantic, study finds

A new study links how many hurricanes form worldwide to air pollution levels. Wednesday's study from the National Oceanic and Atmospheric Administration says cleaner air in Europe and the United States is helping trigger a dramatic increase in the number of Atlantic hurricanes.

Preparations underway for $110 million Tysons Corner wastewater project

Fairfax County plans to start on a $110 million project that involves digging and laying new sewer lines from Tysons to Lorton, Virginia. 

Foul-smelling toxic foam spewing from polluted river takes over Colombian city

Photos show how the massive layer of toxic foam is plaguing the city of Mosquera, Colombia, near Bogota, drifting into residents’ yards and businesses.

One-fifth of reptiles face risk of extinction, new report finds

A comprehensive new assessment of thousands of reptiles species has found that 21% are considered endangered, critically endangered or vulnerable to extinction.

Twitter bans ads that contradict science on climate change

Twitter is banning ads that deny climate change, but there's no indication the change will impact what users can post on the site.