See how much you don't know about energy use and energy sources with this quiz from National Geographic.
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You know from Keystone pipeline protests and oil train derailments that transporting energy can be a contentious issue in the U.S. and around the world. But how much do you really know about how energy travels?
An invasive beetle, the emerald ash borer, is killing millions of ash trees in American cities.
Greendex: Consumer Choice and the Environment - A Worldwide Tracking Survey
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You know that poor insulation makes for a drafty, energy-wasting home, but how much do you really know about the true potential of energy efficiency?
It's home to millions of people who lack even one lamp, but also a frontier of great change and innovation. How much do you know about sub-Saharan Africa's energy potential?