What about Germany? What does that have to do with the efficiency of green energy?
You seem to be confusing Germany's decision to get rid of nuclear power (premature in my opinion) with an actual policy that moves a country away from fossil fuels.
This is not a pie in the sky idea. Iceland, Sweden, and Costa Rica have all succeeded in achieving 100% renewable energy. And dozens of other countries are operating at greater than 50% renewables. For countries like the US where we have a large population and we like to live in big houses - we like to drive big cars - we like to light up our cities like their a god-damn rave scene - etc. the transition is going to take a lot longer and require a lot more investment. But every little bit helps. And the more we do now the smaller price we'll pay economically and environmentally.