1. The Emissions Gap Report 2014: UN Emission Programme Synthesis Report, http://apps.unep.org/redirect.php?file=/publications/pmtdocuments/-The%20Emissions%20Gap%20Report%202014:%20a%20UNEP%20synthesis%20report-November%202014EGR_2014_Lowres.pdf.
2. IPCC AR5, Climate Change 2014 Synthesis report, https://www.ipcc.ch/pdf/assessment-report/ar5/syr/SYR_AR5_FINAL_full_wcover.pdf.
3. World Energy Outlook 2016, http://www.iea.org/newsroom/news/2016/november/world-energy-outlook-2016.html.
4. US-DOE EIA International Energy Outlook 2016, May 11, 2016 (DOE/EIA-0484(2016)) http://www.eia.gov/forecasts/ieo/pdf/0484(2016).pdf.
5. Bloomberg Technology News, July 31, 2017, https://www.bloomberg.com/news/articles/2017-07-31/alphabet-wants-to-fix-renewable-energy-s-storage-problem-with-salt.