Eleven African countries are working to build a green wall of trees on the southern border of the Sahara. Their goal is to fight desertification in the Sahel region.
The U.S. Food and Drug Administration is in the middle of a lengthy review of the chemical triclosan -- a product that's in countless consumer products like toothpaste and soap. There's a movement to try and get the product more stringently regulated in the United States -- or banned outright. And they might have just gotten a boost from Canada.
New research on the air quality around natural gas wells provides additional evidence and controversy about the possible health effects from hydraulic fracturing or "fracking." In Colorado, scientists found that fracking wells emit potentially toxic hydrocarbons into the air.
James Cameron traveled some seven miles down into the ocean, as many miles below the Earth's surface as miles modern jetliners fly above the surface. He engineered a new deep sea submersible for the journey.
A combination of factors have pushed the United States to reverse decades of trends. Oil and gas consumption is down and declining. Oil and gas production, domestically, is skyrocketing. Oil and gas imports are evaporating. All of this has the potentially to revolutionize American foreign relations and the U.S. economy.
Cushing, Okla., is known to some as the pipeline intersection for the world. It's there where President Barack Obama traveled on Thursday to pledge his support for building the southern half of the Keystone XL pipeline, to get oil from Cushing to the Texas Gulf Coast refineries.
As Canada confronts its need for electricity and a desire to reduce the amount of carbon it pumps into the atmosphere, it's turning to two, large hydroelectric dams in Labrador. But there's potential for other environmental damage that has many in the area saying "no thanks."
Canada is emerging as the largest supplier of energy to the United States. It's electricity, natural gas and oil are all being shipped to America, but environmentalists there and here say it's coming with a hefty price tag.
On Svalbard, in Norway, the farthest north inhabited place on Earth, scientists are at the center of research on climate change. It's also become a magnet for politicians, stars and even royalty who are looking to stake a claim as environmentalists.
Research from the U.S. Forest Service found that in 19 of 20 U.S. cities surveyed, urban trees are on the decline. The vital piece of urban infrastructure are declining an average of three percent per year.