What? Citation needed. That's complete BS. See here:

https://www.epa.gov/ghgemissions/sources-greenhouse-gas-emis...

The #1 cause of greenhouse gases is electricity production. #2 is transportation (cars, trucks, planes, ships, trains).

Commercial and residential (including home heating) is only 12%, and agriculture is only 9%.

You're right about mobile devices being peanuts though.