I thought this was a good talk about energy use in the Bitcoin world.<p>Improved efficiency of computing hardware.<p>Increased development of renewable electricity.<p>Development of geothermal energy in remote /economically disadvantaged areas.<p>Use of surplus electricity and methane. Use of methane from landfills (and people farts).<p>On the other hand:<p>They are still using "lots" of energy.<p>Still using "lots" of coal and other fossil fuel sources.<p>Opportunity costs when using surplus sources (could be used else where).