Inconvenient Truths About 'Renewable' Energy

Great article by Matt Ridley from the 5-21 WSJ. Excerpts:

"What does the word "renewable" mean?

Last week the Intergovernmental Panel on Climate Change released a thousand-page report on the future of renewable energy, which it defined as solar, hydro, wind, tidal, wave, geothermal and biomass. These energy sources, said the IPCC, generate about 13.8% 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% out of the 13.8% share, comes from biomass, mainly wood (often transformed into charcoal) and dung. Most of the rest is hydro; less than 0.5% 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."

"...the wind industry depends on steel, concrete and rare-earth metals (for the turbine magnets), none of which are renewable."

"The hydrocarbons in the earth's crust amount to more than 500,000 exajoules of energy. (This includes methane clathrates—gas on the ocean floor in solid, ice-like form—which may or may not be accessible as fuel someday.) The whole planet uses about 500 exajoules a year, so there may be a millennium's worth of hydrocarbons left at current rates."