Exports to most countries have long been barred by federal law. As the Department of Energy considers several requests for export licenses, a study says exporting our glut of natural gas would benefit the economy.

Nurseries spend a lot of effort moving potted plants and trees from one place to another. Robots may replace low-paying, seasonal, grueling work.

Today the British company "Blue Energy" unveiled plans for the largest solar power plant in Africa -- and one of the largest in the world.

As another U.N. climate change summit goes on in Doha, a new study of carbon dioxide in the atmosphere says current levels nearly guarantee a nearly four-degree increase in global temperatures.