1. IPCC. IPCC Fourth Assessment Report (AR4), Working Group 1. Chapter 2, Changes in atmospheric constituents and in radiative forcing. Intergovernmental Panel on Climate Change (IPCC); 2007.
2. IPCC. Climate change 1995: The IPCC Second Assessment Report. Intergovernmental Panel on Climate Change (IPCC);1995.
3. Moussa G, Ch’ng SW, Park DY, Ziaei H, Jalil A, Patton N, et al. Environmental effect of fluorinated gases in vitreoretinal surgery: a multicenter study of 4,877 patients. Am J Ophthalmol. 2021. http://www.ajo.com/article/S0002939421004773/fulltext.
4. UNFCCC. What is the Kyoto Protocol? United Nations Climate Change. 2020. https://unfccc.int/kyoto_protocol. Accessed 5 January 2022.
5. England N NHS becomes the world’s first national health system to commit to become ‘carbon net zero’, backed by clear deliverables and milestones. 2020. https://www.england.nhs.uk/2020/10/nhs-becomes-the-worlds-national-health-system-to-commit-to-become-carbon-net-zero-backed-by-clear-deliverables-and-milestones/.