An Energy Evolution: From Delicious to Dirty to Almost Free

If you think about the history of humans (disclaimer, I'm a human) you could make the argument that history is about the quest for energy. Not just any old energy, we want it cheap or maybe even free. If you have nearly limitless energy, you can do pretty much anything. You can extract the materials you need from the air, water, or land. You can build stuff. You can go to space. Energy is the key. But our quest for endless energy has caused some problems too.

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