1. AstraZeneca's ‘Ambition Zero Carbon’ strategy to eliminate emissions by 2025 and be carbon negative across the entire value chain by 2030, https://www.astrazeneca.com/media-centre/press-releases/2020/astrazenecas-ambition-zero-carbon-strategy-to-eliminate-emissions-by-2025-and-be-carbon-negative-across-the-entire-value-chain-by-2030-22012020.html
2. Planet Mobilization, https://www.sanofi.com/en/our-responsibility/planet-mobilization
3. Our commitments, https://uk.gsk.com/en-gb/responsibility/our-planet/our-commitments/
4. Climate change, https://www.pfizer.com/purpose/workplace-responsibility/green-journey/climate-change
5. J. M. Fortunak , J.Zhang , F. E.Nytko III and T. N.Ellison , in Green Techniques for Organic Synthesis and Medicinal Chemistry , ed. W. Zhang and B. W. Cue , John Wiley & Sons Ltd , UK , 2nd edn, 2018 , ch. 23, pp. 621–647