Antimatter power sources would be most convenient. Nice pipe dream. The problem is that hydrogen and antimatter are both energy transports, not sources. We still gotta make it somehow. I think Sue's nano-solar guys have the right idea. Spray the stuff everywhere. Make it so ubiquitous and cheap and clean that microgeneration of power means that burning hydrocarbons becomes a very small subsector of power consumption.

Use the biomass for producing chemicals that we now get from a hole in the ground. Gotta love Tesla. I read his biography when I was 13 and he's a most amazing fellow. WAY ahead of his time. We owe much of our modern way of life to his genius