1. Victor DG, Zhou D, Ahmed EHM, Dadhich PK, Olivier JGJ, Rogner H-H, et al. Climate Change 2014: Mitigation of Climate Change. Contribution of Working Group III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, United Kingdom and New York, NY, USA: Cambridge University Press; 2014 [chapter 1].
2. Net-zero emissions energy systems;Davis;Science,2018
3. BP. BP Energy Outlook - 2019 edition. Report, BP; 2019. Available online at www.bp.com/content/dam/bp/business-sites/en/global/corporate/pdfs/energy-economics/energy-outlook/bp-energy-outlook-2019.pdf.
4. Central Intelligence Agency. Field Listing: Pipelines - The World Factbook; 2019. Website: www.cia.gov/library/publications/the-world-factbook/fields/383.html [accessed: 19/06/2019].
5. Speirs J, Balcombe P, Johnson E, Martin J, Brandon N, Hawkes A. A greener gas grid: what are the options? Report. Sustainable Gas Institute; 2017. Available online at www.sustainablegasinstitute.org/a-greener-gas-grid/.