Arsenal are the first in the Premier League to join the UN Sports for Climate Action Framework.
It means pledging to help fight climate change and helping others do the same.
Signing up to the framework commits the club and their staff to five key principles aimed at reducing their climate impact as part of attempts to limit global warming:

• Undertake systematic efforts to promote greater environmental responsibility

• Reduce overall climate impact

• Educate on climate action

• Promote sustainable and responsible consumption

• Advocate for climate action through communication.

some of the environmentally friendly initiatives undertaken by Arsenal so far:
Heres some stuff they have already done towards this end..
1. They have installed a large-scale battery energy storage in 2018. The battery storage system can power the 60,000-seat Emirates Stadium for an entire match.
2. They have planted more than 29,000 trees at the club’s training centre in London Colney since 1999, to create the Colney Wood.
3. They have installed a water recycling system at the training centre to reuse water that comes from the pitch – in the last year, this has seen more than 4.5 million litres of water recycled.
Became the first Premier League club to switch to 100% green electricity.
4. They save 20,000 single-use plastic cups per game when Emirates Stadium is full through a reusable cup scheme.
5 .They have water dispensers across all sites – saving 150,000 single-use plastic water bottles per year.
6.They have reduced energy by installing automated LED lighting at all club sites.
So that’s even more very good reasons to become an Arsenal Supporter.