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The above categories represent the largest potential generators of renewable energy, but there are lots of other things that don't fall into those neat boxes. This place is for all the unexpected, strange, and clever power generation ideas that might fall around the edges.
Just as climate change is happening because of the small actions of billions of people, there are many small ways to have a big net impact—this team has developed a system that uses the motion of walking to charge a powerpack. Right now, you have to walk 15 miles to charge a smartphone, but they're working on cutting that down to 5 miles, and it's certainly enough to run a small mp3 player while you work out!