NOT ALTERNATIVE ENERGY
Energy from the sun, the wind and the tides is often referred to as 'alternative energy.' The implication is always that it is some kind of fringe alternative to the real energy, the primary energy, the mainstream energy, which is, of course, of oil and coal. It is only some inferior breed of energy, it is 'alternative-lifestyler' energy, it is hippie stuff that serious people look down on (but which we might one day take seriously when we are forced to).
Bunkum. It is the Black Stuff energies that are the alternatives. And very bad ones. So bad that we should never have used them. Real energy, mainstream energy, is clean. The alternatives are therefore dirty and should be looked down on by any human being worthy of the name.
The wise course is always to take the best way as the main way, and label inferior ways as alternatives that we might use at a pinch. With energy we got it back to front.
The real, the main, the primary source of energy was and always will be the sun. Solar power has always powered the earth. Try switching it off with a nuclear winter (the effect of blotting out the sun with a global nuclear war) and see what happens. It is also the power behind all weather-based energy, such as hyro-electric and wind generation.