Mark Z. Jacobson and Mark A. Delucchi, Scientific American
A plan to achieve 100% renewable energy in twenty years.
Supplies of wind and solar energy on accessible land dwarf the energy consumed by people around the globe. (WWS = Wind, Water, Solar)
The authors’ plan calls for 3.8 million large wind turbines, 90,000 solar plants, and numerous geothermal, tidal and rooftop photovoltaic installations worldwide.
The cost of generating and transmitting power would be less than the projected cost per kilowatt-hour for fossil-fuel and nuclear power.
This is possible but shortages of a few specialty materials, along with lack of political will, loom as the greatest obstacles.
If you haven’t seen this, here is a marvelous primer on how this could be done – well worth your time in clicking on it! http://www.scientificamerican.com/article.cfm?id=powering-a-green-planet