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Renewable energy sources are basically anything that doesn't expire once used. For example, lets look at a coal fire to illustrate this point
To start the fire you need to use paper, once it's burnt that's it... it's gone forever.
Next you'd use kindling to get the flames a little stronger, but again once the kindling has burned you'll never see it again.
So on with the coal to get a roaring fire. With every load of coal that goes on the fire, once used it is unusable again. This is NOT a renewable energy source, once burned it's gone for good. This coal has to be mined from the earth, so we are actually taking resources out of our ground and burning them. You can see how quickly this process could lead to shortages if all the houses in the world were still relient on coal for their fires.
So instead we look to renewable energy sources that won't run out. Sun, water and wind which can all be harnessed in some way to generate our energy needs. Go here to read more about this fascinating subject - renewable energy sources
What is wind power?
Wind power is the energy generated by the wind which is captured and converted in to the electricity that we can all use in our homes and businesses. We as a planet are constantly on the lookout for more sustainable energy sources and wind power is one of the leading proponents of this movement.
The downside to relying on wind is that it is a natural force of nature. It would be like relying purely on rain water to run machines, there could be no guarantees that there would be constant supply and this is one of the biggest problems about adopting wind power in a big way.
Go here to read the full story and get a very interesting perspective on exactly what wind power is and how it can work for us as a planet - what is wind power