Recycling Rates of Smartphone metals

http://www.compoundchem.com/wp-content/uploads/2015/09/Recycling-Rates-of-Smartphone-Elements.png

The Surprisingly Large Energy Footprint of the Digital Economy [UPDATE]

http://science.time.com/2013/08/14/power-drain-the-digital-cloud-is-using-more-energy-than-you-think/

What's the carbon footprint of ... email?

https://www.theguardian.com/environment/green-living-blog/2010/oct/21/carbon-footprint-email

What's the carbon footprint of … the internet?

https://www.theguardian.com/environment/2010/aug/12/carbon-footprint-internet