Since this article is about biodiversity, the usual advice to address pollution don't fit perfectly. Biodiversity require a multitude of biotope and the preserv

Since this article is about biodiversity, the usual advice to address pollution don't fit perfectly. Biodiversity require a multitude of biotope and the preservation of high bio density biotope such as rain forest and corals. Don't buy beef from places that burn down rain forests in order to raise cattle. Don't buy fish from trawling. Be extra careful with net caught fish and farmed fish, both which has higher risk of causing problem in the eco system. Similar with vegetables. Oils from rain forest is to be avoided. Food from farms next to lakes that suffer from eutrophication is a major problem. Signs of overpopulation in lakes is a final indication of harm. Sustainable fishing and wild game is one of few places where I know you can get some advice from governing bodies that tries to manage bio diversity. They are imperfect but at least they discuss the topic. Sadly there isn't much for other kind of food and ecological standards don't cover bio diversity or sustainability as criteria.