https://www.nature.com/articles/d41586-018-06610-y
Compare that to https://www.epa.gov/ghgemissions/sources-greenhouse-gas-emis...
I don't know if it takes the lifecycle of hardware into account.
https://www.nature.com/articles/d41586-018-06610-y
Compare that to https://www.epa.gov/ghgemissions/sources-greenhouse-gas-emis...