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&#x27;t enough.  By focusing on low hanging fruit, we might feel like we&#x27;re making a difference, and lose the urgency to search for more innovative solutions.<p>I&#x27;m sure Bill supports anything that can reduce CO2 emissions, but I expect his feeling is that we don&#x27;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&#x27;t want to dilute the main point of this particular essay by focusing on existing tech.<p>(That said, he does talk also about improved energy storage and power lines and such, things that would build on existing clean energy sources.)