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Energy obtained from sources that are essentially inexhaustible, unlike, for example, the fossil fuels, of which there is a finite supply. Renewable sources of energy include wood, waste, geothermal, wind, photovoltaic, and solar thermal energy.

• Scientists Propose Planting Trees in the Desert to Combat Climate Change
  Desert photo from Shutterstock A group of German scientists led by Klaus Becker of the University of Hohenheim believes that planting drought-tolerant vegetation in arid regions could capture CO2 and mitigate the effects of climate change...