Aerial view of city at meeting of rivers (© AP Images)

Cities as policy labs: Pittsburgh’s towering experiment

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.

Capture the carbon, clean the air

New technologies suck CO2 from sources before it enters the atmosphere. The U.S. expands this technology to reduce emissions contributing to climate change.
Spiral graph showing rising global temperature data (Ed Hawkins)

You haven’t seen climate change like this before

Climate scientist Ed Hawkins has created a dramatic animation to illustrate how much global temperatures have risen over the past 166 years.

We’re taking action on climate change  —  and the world is...

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.

A city drought caused by destruction of a rainforest?

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....
Power plant smokestacks emitting carbon dioxide and other greenhouse gases (Shutterstock)

Castles in the air? Carbon dioxide could produce building materials.

A new technique that takes CO2 emissions generated by factories and cars could create new material for buildings, aircraft and athletic equipment.
Artist's rendition of solar roadway, with lights glowing in foreground panels (Courtesy of Solar Roadways)

Is it sunrise for solar highways? [video]

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.

At ground zero for climate change, traditions and livelihoods hang in...

People across the Arctic are facing extreme weather, unpredictable hunting seasons, unstable ice and other effects of global warming. What can they do?

The greening of the bottom line

More companies are introducing sustainable practices into their manufacturing processes and products, helping the environment and improving profitability.