An individualist might be a rugged John Wayne, a pioneer like Amy Johnson, a creative innovator like Kate Bush, or an entrepreneur like Richard Branson.
There are teams of innovators right now in the field that are working on figuring out how to most efficiently and effectively tap this enormous heat source beneath us.
But as growing populations and densely packed cities stress these systems, innovators around the world are imaginating faster more sustainable ways to get from A to B.