A trillion dollars' worth of heavy crude oil has attracted the world's oil titans to western Canada — and they're making a mess. The World and GlobalPost's GroundTruth Project head to the skies for a look at the sweeping impact of oil extraction from the Alberta Tar Sands.
Noxious dust storms rising up from Mongolia have plagued Korea. Now a small group of Korean and Mongolian activists are working together to attack the problem by planting trees in the Gobi desert. The World's Daniel Grossman has the story.
The World's Daniel Grossman reports from Greenland on disturbing changes. A new report says ice in Greenland and other northern regions is melting far faster than predicted just a few years ago, with possibly serious consequences for global sea levels.