[tempestn]

I think the point is that those sorts of smaller innovations can be a trap. As he says at the start, even reducing CO2 emissions by 50% isn't enough. By focusing on low hanging fruit, we might feel like we're making a difference, and lose the urgency to search for more innovative solutions.

I'm sure Bill supports anything that can reduce CO2 emissions, but I expect his feeling is that we don't need more encouragement to look for little efficiencies; rather we need to find a big solution. Or maybe we need encouragement on both fronts, but he didn't want to dilute the main point of this particular essay by focusing on existing tech.

(That said, he does talk also about improved energy storage and power lines and such, things that would build on existing clean energy sources.)