Reactor accidents and radiation leaks aren't the only risks with nuclear energy; nuclear weapons are another problem.
Engineers who design nuclear plants can plan a worst case scenario, but this may not be enough to prevent all accidents.
Both India and China have big expansion plans for nuclear power. Here's a look at why they are expanding and what the risks are.
With what feels like an especially long winter coming to an end, Dr. Heidi Cullen gives a climate outlook for spring 2011.
Besides being a force of nature, the wind is a promising renewable energy resource. But where does wind come from, and what's its true energy potential?
What weÃ¢Â€Â™ve known as Ã¢Â€ÂœnormalsÃ¢Â€Â for our climate during the past decade will very likely change soon.
Climate Central's Heidi Cullen counts down the five biggest climate events of 2010.
The currents around the equator in the Pacific Ocean are cooler than average this year, which means we are experiencing the phenomenon known as La Niña. This can bring good weather conditions, or poor ones, depending on where you live and your point of view. Dr. Heidi Cullen explains.