- ---. “The Carbon Cost of an Email”. The Carbon Literacy Project, 19 Nov. 2020, https://carbonliteracy.com/the-carbon-cost-of-an-email/.
- Chart 1. Test Alt-Text for Almanac Images.
- “Estimating Carbon Dioxide Emissions from Coal Plants”. Global Energy Monitor, 29 Apr. 2021, https://www.gem.wiki/Estimating_carbon_dioxide_emissions_from_coal_plants.
- Johnson, Joseph. “Daily Number of E-Mails Worldwide 2025”. Statista, 19 Oct. 2019, https://www.statista.com/statistics/456500/daily-number-of-e-mails-worldwide/.
- McDonnell, Tim. “Don’t Worry about the Carbon Footprint of Your Emails”. Quartz, 25 Nov. 2020, https://qz.com/1937309/dont-worry-about-the-carbon-footprint-of-your-emails/.
- Molloy, David. “Climate Change: Can Sending Fewer Emails Really Save the Planet?”. BBC News, 19 Nov. 2020. www.bbc.com, https://www.bbc.com/news/technology-55002423.