Once a declining industrial metropolis with steel mills spewing black smoke and soot into the sky, Pittsburgh has transformed itself into a vibrant green city.
New technologies suck CO2 from sources before it enters the atmosphere. The U.S. expands this technology to reduce emissions contributing to climate change.
The U.S. and China, the world’s two largest economies and biggest greenhouse gas emitters, surprised the world with their plans to combat climate change.
South America's biggest and wealthiest city is waiting for the rain. If it doesn't come soon, São Paulo could run out of water before 2015....
Climate scientist Ed Hawkins has created a dramatic animation to illustrate how much global temperatures have risen over the past 166 years.
Solar roadways are coming to the U.S. as pilot projects. The tiles that create the roads act as solar panels but can also solve other environmental issues.
People across the Arctic are facing extreme weather, unpredictable hunting seasons, unstable ice and other effects of global warming. What can they do?
More companies are introducing sustainable practices into their manufacturing processes and products, helping the environment and improving profitability.
Molten salt could be the key to unlocking a future full of renewable energy. During peak times the salt stores solar power that can be saved and used later.