Allbirds are the truly sustainable sneaker brand out there; who also happen to make stylish-af shoes. Look cool, but also very performant for sports of any kind. I use them in any weather and they are currently the only non-flip-flop or tropical shoes I carry with me in my perpetual travel state.
The company aims to be carbon-zero by 2030, and they're already half-way there in 2023. Shoes are entirely made out of sustainable material. Good stuff folks. Check out their programs here: https://www.allbirds.com/pages/sustainable-practices#priorities