Good dog parents might think they’re doing their part by using biodegradable baggies to pick up after their pooches. But after Fido’s feces go in the trash can and to a landfill, they release methane gas, a significant contributor to the greenhouse effect. A dog park in Cambridge, Mass., has a solution: Add in a methane digester, and let your dog waste power the streetlights, tea cart and popcorn machine.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.