I do not think the big issue is CO2 emissions but there is a problem with using fussel fuels and non renewable energy for numerous other reasons. And consumerism will destroy the world if it is not dealt with properly. I don't think it will be from climate change by carbon dioxide that the world will be destroyed but simply from depleting non renewable resources and causing extinction of plants and animals and possibly nukes or genetic engineering mistakes.
Exercise is the most natural source of work and it produces carbon dioxide and water. If people were to abolish all power plants and non renewable energy then power would come with a larger carbon footprint, as people would use physical labour as their only source of work but this might be cleaner than some other options with a lower carbon footprint.
Copyright Carl Janssen 2018 October 31
The treadmill's dark and twisted past - Conor Heffernan
https://m.youtube.com/watch?v=Al-30Z-aH8M
https://web.archive.org/web/*/https://m.youtube.com/watch?v=Al-30Z-aH8M
https://web.archive.org/web/20170119223232/https://www.youtube.com/watch?v=Al-30Z-aH8M&app=desktop
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