EN LA LÍNEA del post del otro día, Ray Kurzweil dice que la energía solar proporcionará suficiente energía para todo el planeta dentro de 20 años:

There is 10,000 times more sunlight than we need to meet 100 percent of our energy needs, he says, and the technology needed for collecting and storing it is about to emerge as the field of solar energy is going to advance exponentially in accordance with Kurzweil's Law of Accelerating Returns. That law yields a doubling of price performance in information technologies every year.

ACTUALIZACIÓN. Me había olvidado del segundo link.