75% in 10 years, 100% in 20 years.
Along with an increase of conservation reserve cropland and wetlands to reverse GHG concentrations, a 50% increase from the present. Presently 1/3 of our GHG emissions are absorbed by conservation reserve and park land.
http://thefraserdomain.typepad.com/energy/2006/12/acore_conferenc.html#comment-26050525
75% renewable energy use in 10 years, 100% in 20 years. That's a better goal.
The devestation from GHG caused climate disaster without that better performance may inundate every major coastal city on earth. And the melt loss of the arctic ice impelled water conveyor that powers the gulf stream will plunge the US and Europe into an ice age.
That will cost orders of magnitude more than this more ambitious renewable energy goal. In fact the energy revolution will pay its own way, and even more, in economic success. Jobs, tax base, and lowered costs from climate related damage.