This fall, at Stanford University, Dr. Mark Z. Jacobson published a
"Review of Global Warming Solutions," comparing the lifetime
CO2-equivalent emissions of energy sources. Wind and concentrated solar
emit between about 3 to 11 grams of CO2 per kilowatt-hour (kWh) of
electricity. Geothermal and conventional solar emit between 16 and 64
grams; wave, tidal and hydro power emit 34 to 71 grams. Nuclear
electricity emits between 68 and 180 grams per kWh. Jacobson concludes
that "Coal ... and nuclear offer less benefit [and] represent an
opportunity cost loss."