A 2008 paper from the Lawrence Berkeley National Laboratory suggests it takes 13kWh to transmit 1GB.[…] According to EPA figures, the average U.S. power plant emits 1.2 pounds of carbon dioxide equivalent (called CO2e) per kWh produced. If we multiply 13kWh by 1.2 pounds, we get 15.6 pounds of CO2e—and that’s just to transfer 1GB of data. […] But these numbers do give us a framework for seeing the relationship between page size and carbon footprint—and make it clear that cutting gigabytes saves CO2.
The first place to start trimming? In our designs.”