People don't know livestock are significant contributors to greenhouse gases? It's way, way less efficient to raise animals to eat than it is to just eat the foods you grown for them (or replace them with other crops). And cattle (cows, beef) is WAAAY worse than any other livestock animal.
Best thing to do individually is to reduce beef consumption. Vegetarianism is the actual best, but austerity for the masses is bullshit when billionaires do nothing. But if you want to help, reducing or eliminating beef is one of the better options food-wise.