Petroleum and other fossil fuels (coal and natural gas) are causing long term changes in the global climate, but few people appreciate the risks.

The amount of solar energy reaching the surface of the planet is so vast that in one year it is about twice as much as will ever be obtained from all of the Earth's non renewable resources of coal, oil, natural gas, and mined uranium combined,Solar energy can be harnessed at different levels around the world, mostly depending on distance from the equator.