You don't. You enforce laws on deforestation. Either by replacing every cut tree with a new planted one somewhere not good for farmland, or just banning it. Supply would plateau and the price of the commodity will go up which is unfortunate but the reality of increased demand.
Continuing to support demand for beef at current rates as the population grows means that beef production must increase. That means we need more cows. Where do you propose we put all those cows? The current solution has been to cut down trees to create usable land. What's your alternative?
I can’t tell at this point if you just don’t understand causality, you’re fishing for downvotes (is that a thing on Lemmy now?), or you’re a meat industry shill