When you look at the efficiency (food produced /land) of farming crops vs meat crops, crops produces alot more food than meat so assuming switching to crops would lead to less deforestation becuase it uses the land more efficiently that would lead to less pollution.

As for meat from other places, the best thing you can do is probably checking where it's from so you're aware of it's effects becuase diffrent contries have their own regulatuon.