The futility of efficiency gains is touched upon in Bill and Melinda&#x27;s annual letter this year<p><a href="https:&#x2F;&#x2F;www.gatesnotes.com&#x2F;2016-Annual-Letter" rel="nofollow">https:&#x2F;&#x2F;www.gatesnotes.com&#x2F;2016-Annual-Letter</a><p>He talks about the Energy Equation and declares green energy as the only solution to our carbon emissions.