What energy resources might replace petroleum supplies one day?

1. geothermal energy, which uses hot water or steam from the earth's core,
2. wind turbines, which transfer the kinetic energy in the wind into electrical energy,
3. solar panels, which change the light energy of the sun into electrical energy,
4. methane plants, which use the methane generated by decomposing trash to heat homes and busineses,
5. nuclear fission and later fusion plants which use uranium to heat water and create electricity, and last but not least,
6. hydroelectric dams and powerplants that use running water to turn turbines and generate electricity.

A:

• Wind Energy
• Hydro Energy
• Geothermal Energy
• Solar Energy
• Nuclear Energy

A:

There really aren't any practical ones right now. Solar power is only available in daylight, in good weather, and has some environmental problems; they fry birds in flight, and blind pilots. Wind power is even harder on the bird population, and is even less reliable than solar. Large wind turbines tend to fall down with monotonous regularity. Nuclear fission works well, until you have a giant earthquake and a tsunami that washes away the backup generators....

Hydrogen fusion power is about 20 years away, and has BEEN "20 years away" for about 40 years now.

Space-based solar power satellites will probably work, except right now we have no spacecraft, and we're angry with the Russians who are the only people who have any. "Electric" cars are actually coal-powered, because a big percentage of the US's electrical power is coal.

It's all well and good to talk about rooftop solar panels and backyard windmills, but you can't run an industrial civilization that includes steel mills and aluminum smelters on rooftop solar panels.