On Earth Day, according to various advocates, "events are held worldwide to increase awareness and appreciation of the Earth's natural environment." As we observe the event Tuesday, it might be a good time to appreciate the fact that Americans get most of their plentiful, affordable energy directly from the Earth's "natural environment" in the form of fossil fuels (coal, natural gas, and petroleum). It's largely those energy sources that fuel our vehicles and airplanes; heat, cool and light our homes and businesses; power our nation's factories; and in the process significantly raise our standard of living. Shouldn't that be part...