Sun radiation
        All renewable energy sources (except tidal and geothermal power) and even the energy in fossil fuels, ultimately come from the sun. The sun radiates 100,000,000,000,000 kilowatt hours of energy to the earth per hour, or else the earth receives 10 to the 18th power of watts of power. About 1-2% of the energy coming from the sun is converted into wind energy. That is about 50 to 100 times more than the energy converted into biomass by all plants on earth.

Temperature differences drive air circulation Sea surface temperatures (from satellite)
        The regions around equator, at 0° latitude, are heated more by the sun than the rest of the globe. These hot areas are indicated in the warm colours, red, orange and yellow in this infrared picture of sea surface temperatures (derived from a NASA satellite, NOAA-15 in March 2005).
        Hot air is lighter than cold air and will rise into the sky until it reaches approximately 10 km (6 miles) altitude and will spread to the North and the South. If the globe did not rotate, the air would simply arrive at the North Pole and the South Pole, sink down and then return to the equator.