In addition to direct collection of solar energy several indirect sources of this important resource exist. They include the wind, powered by differential heating of the earth's surface, ocean currents (produced by a similar mechanism), hydroelectric, powered by solar-powered water evaporation and condensation into rivers, ocean thermal energy conversion (based on solar-heated surface layers of the tropical oceans), and ocean waves, driven by the wind and carrying energy with them as they approach the shoreline.
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Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.