This week: Alternative energy
Fossil fuels are relative newcomers as energy sources. For as long as water has been running downhill, there has been a cheap, renewable, readily available energy source.
The energy created by water flowing downhill under the influence of gravity has been harnessed for hundreds of years. Factories in the 19th century were built at waterfalls or along rivers where the energy of flowing water could directly turn the waterwheel that drove their machinery.
In modern times, this energy is used to turn turbines that create electricity for distribution over power lines to large areas. Hydroelectric power is relatively inexpensive, clean, it produces no greenhouse gasses or smog, and it is renewable for as long as water can be made to run downhill.
Tomorrow: is there a downside to hydroelectric power?
Photo credit: http://www.top-alternative-energy-sources.com/images/water-wheel.jpg
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