Green energy: neither free nor forever
One argument sometimes heard in favor of green energy is that sources such as wind and solar are “free, forever.” Al Gore, in particular, has said repeatedly that to end our “overdependence on outdated, heavily polluting carbon-based technologies . . . we need sources that are free forever, like the sun, wind and earth.” (See also here, here and here.)
On a superficial glance, this might seem to have a certain ring of plausibility. To use the energy in oil, coal and natural gas takes a lot of work and resources: the fuels have to be discovered, extracted, transported, processed, refined, and distributed—all at great effort and expense.
By contrast, sunlight and wind are flows of energy that already occur all by themselves in nature. Sunshine is, literally, a stream of electromagnetic energy flowing onto the earth. Similarly with wind, which consists of air particles that carry kinetic energy by the very fact of their being in motion. We can feel the effects of such energy without effort, just by sitting in the sun and enjoying the breeze.
But if you give this even a tiny amount of additional thought, you should quickly realize that the “free forever” argument is just plain silly.

In
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