> Human labor is very environmentally friendly
No it is not. For example a meat eating human produces more CO2 per mile than a regular car. (Although most people could use the exercise so don't use that info in isolation.)
No it is not. For example a meat eating human produces more CO2 per mile than a regular car. (Although most people could use the exercise so don't use that info in isolation.)
Again, many people need exercise so this might just replace that. But if you exert extra, then you need extra food. Food costs CO2, and humans are not very efficient.