Are Renewable Energy Sources Really "Green"?: "According to the Intergovernmental Panel on Climate Change (IPCC), renewable energy sources generate about 13.8 percent of our energy and, if encouraged to grow, could eventually displace most fossil fuel use. It turns out that the great majority of this energy, 10.2 percent out of the 13.8 percent share, comes from biomass, mainly wood (often transformed into charcoal) and dung. Most of the rest is hydro. Less than 0.5 percent of the world's energy comes from wind, tide, wave, solar and geothermal put together. Wood and dung are indeed renewable, in the sense that they reappear as fast as you use them. Or do they? It depends on how fast you use them, says the Wall Street Journal."
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