Which is another variant of the "it doesn't matter because it's renewable energy" argument. If all this renewable energy was so easy and free to get, we wouldn't have headlines like those on the Daily Telegraph every other week.
The target is 20% by 2020. It's going to be a struggle to get to 100%. We can't be so flippant as to throw it away on schemes that need 6x as much as the real solution.