I will explain.<p>Firstly, I think you are underestimating the societal impact that would have led a cryptocurrency to be worth $1 trillion. It would mean it has succeeded on a massive scale: foreign trade made more fluid thanks to Bitcoin&#x27;s disregard of political borders, hundreds of millions of people using it to escape inflation&#x2F;financial restrictions&#x2F;etc (vs. today&#x27;s few million users), millions of merchants accepting it (vs. today&#x27;s 130 000 merchants). All Bitcoin would have to accomplish to justify using 0.X% of the world&#x27;s energy is to increase the world GDP by 0.X%.<p>Secondly, 0.74% is an upper bound. It assumes power costs of $0.01 per kWh (read section 2 at <a href="http:&#x2F;&#x2F;blog.zorinaq.com&#x2F;?e=82" rel="nofollow">http:&#x2F;&#x2F;blog.zorinaq.com&#x2F;?e=82</a>) when actually the average power cost worldwide is 10x higher ($0.10&#x2F;kWh). Maybe it will be 0.3% of the total energy. Maybe 0.1%. How low is low enough that you would consider it worthwhile?