Sooner or later fossil fuels are going to run out. That will drive up the price as it happens so the alternatives will then become profitable. It's a problem that will solve itself , no grand government controlled scheme is necessary.
“Sooner or later fossil fuels are going to run out.”
Can’t be too soon. First should go are the wind mills, then the Solar panels (except for roof tops). Both take too much of productive fields and make America ugly for no good reason. We need that land to feed our expanding population.