There was a time when green building was seen as a newfangled fad for people with money to burn. But now we're starting to see the light, so to speak. Studies have shown that sustainable buildings cost only about 2 percent more to build than traditional buildings do -- and they'll pay you back many times over in energy savings. So how much do you know about building green?
Question 1 of 10
LEED stands for Leadership in Energy and Environmental Design.
Question 2 of 10
Green is the highest LEED rating.
Question 3 of 10
A brise-soleil system stores energy from sunlight and uses it to power a building's HVAC system.
Question 4 of 10
Fly ash is a byproduct of coal burning that can be used to make energy-efficient insulation.
Question 5 of 10
Many sustainable buildings recycle gray water into drinking water.
Question 6 of 10
The "Living Machine" at Oberlin College treats and purifies wastewater for use in toilets.
Question 7 of 10
The "solar umbrella" of PV panels on the creatively named Solar Umbrella House in Venice, Calif., supplies half of the building's energy.
Question 8 of 10
Chipotle is the first restaurant chain to have a LEED Platinum-certified building.
Question 9 of 10
The Environmental Protection Agency headquarters in New York City has the city's largest green roof, at 2.5 acres.
Question 10 of 10