I only skimmed the article, so may have missed something, but it doesn't seem that they are taking into account how much CO2 emission humans emit just for livin

I only skimmed the article, so may have missed something, but it doesn't seem that they are taking into account how much CO2 emission humans emit just for living. If I spend an hour writing my emissions will be about the same as if I had instead spent that hour reading, or watching TV, or playing my guitar, or doing most other things I do. Computers can be turned off when not working so only need to cause CO2 emission when actually working. Humans cannot be turned off between jobs.