100% renewable is a pipe-dream.
I call bullshit.
- Because the consumption rate is far higher than the production rate, we'll eventually run out of non-renewable (actually, poorly-renewable) energy sources. From then on, it's inevitable that all energy we use is 100% 'renewable'.
- Of course it's a pipe-dream if we're not willing to use it. There are plenty of opportunities we haven't taken yet. There are many ways to harness geothermal, gravitational (tidal power) and solar power, directly or indirectly, more than we've touched so far.
- The only reason combustion engines are so efficient is because they're supported by decades of research. Give it time, and renewable energy can be efficient enough to replace it.
- Besides increasing production, we should also work on reducing consumption. Don't assume that the trend of increasing energy use continues the way it does now.