POWER FOR THE WORLD: All we need is the wind, the water, and the sun.

• 3.8 million wind turbines, 5 megawatts each, supplying 50 percent of the projected total global power demand

• 49 000 solar thermal power plants, 300 MW each, supplying 20 percent

• 40 000 solar photovoltaic (PV) power plants supplying 14 percent

• 1.7 billion rooftop PV systems, 3 kilowatts each, supplying 6 percent

• 5350 geothermal power plants, 100 MW each, supplying 4 percent

• 900 hydroelectric power plants, 1300 MW each, of which 70 percent are already in place, supplying 4 percent

• 720 000 ocean-wave devices, 0.75 MW each, supplying 1 percent

• 490 000 tidal turbines, 1 MW each, supplying 1 percent.

Read the details. The plan is completely unrealistic.