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Ritter: To spur cleantech, focus on national security, not climate change
Electric planes: the future of air travel?
First mile, last mile: plugging gaps in city commutes
How do you solve a problem like next-gen biofuels?
Texas city's government uses 100% renewable energy
Tercek: Environmental movement needs to 'cross boundaries'
Why LED light bulbs cost so much (and how that's about to change)
Kickstarter project will send your own satellite into space
In Rwanda, architecture that empowers and heals
The tricky realities of regulating private space flight