> but lets assume 29 grams of CO2e per GB

29 grams for something that takes most folks less than 20 seconds to download? How many watts (neglecting the machinery was going to be running regardless of whether you are transferring something!) do you think it takes to transfer data?

https://www.eia.gov/tools/faqs/faq.php?id=74&t=11

Coal, the absolute worst of all, represents 18 grams over 60 full seconds to produce 1000 watts of power.