1. Association of American Colleges and Universities (2021) Advocacy for Liberal Education, found at https://www.aacu.org/advocacy-liberal-education-0. 12 February 2021
2. BP (2021a), Energy use by sector, found at https://www.bp.com/en/global/corporate/energy-economics/energy-outlook/demand-by-sector.html. Accessed 14 February 2021
3. BP (2021b) Statistical review of world energy, Excel spreadsheet download, Statistical Review of World Energy - all data, 1965–2019. Found at https://www.bp.com/en/global/corporate/energy-economics/statistical-review-of-world-energy.html. Accessed 14 February 2021, percent calculations by authors
4. Carson R (1962) Silent Spring. Houghton Mifflin, Boston, p 368
5. Global Council for Science and the Environment (2021) Mission and history. Found at https://www.gcseglobal.org/mission-and-approach, 12 February 2021