Formula 1 has recently announced they are planning to become carbon neutral by 2030. You can read about it here: https://www.bbc.co.uk/sport/formula1/50382898
Wimbledon are aiming to reduce emissions from their operations to ‘net zero’, be a resource-efficient organisation and contribute to a ‘net gain’ in biodiversity all by 2030: https://www.wimbledon.com/en_GB/atoz/sustainability.html
See more of what the national stadium in Wales (Cardiff) are doing to make sure they are managing their environmental impact whilst hosting large-scale sporting events: https://www.principalitystadium.wales/information/sustainability/
Sport England announced a new strategy in January 2021, one of their five main focus points is active environments which includes the promotion and protection of open/green spaces: https://www.sportengland.org/why-were-here/uniting-the-movement/what-well-do/active-environments
Twickenham, the home of the English rugby team, has introduced a reusable Fan Cup to replace the flimsy, disposable cups that were previously used during games. Around 140,000 pints of beer could be served during an international match meaning 140,000 cups were likely to be thrown away.
Premier League (Football)
The BBC worked with the UN to create a new league table – this time ranking all 20 premier league clubs on their sustainability initiatives. Arsenal came out on top, but you can view the full table here: https://www.bbc.co.uk/sport/football/50317760