Uhm... isn't that exactly what I wrote? Besides, the CO2 that we humans exhale doesn't count towards global warming because the carbon in it is part of the natu

Uhm... isn't that exactly what I wrote? Besides, the CO2 that we humans exhale doesn't count towards global warming because the carbon in it is part of the natural carbon cycle. That's roughly the same amount that gets reabsorbed into plants that are grown for next year's food. What really matters is the carbon that is added to that cycle from sources outside this biological cycle. In other words, the 1kWh of electical power is strictly worse than the 1kWh of human power as long as some fraction of it comes from non-renewable sources. At best, if it were sourced purely regeneratively, it would be exactly even.