1) Making sure that there is a wide variety of species is important for the planet, because if one species goes, it creates a chain reaction. It all starts with overpopulation of one species, that one species food is going to go faster and they are going to die and their predators are going to go too. It can create a global chain reaction.
2) Habitat destruction is a factor in this problem as well. Once again, species is lost resulting in the chain reaction spreading globally. Habitat destruction isn't only happening in a certain area, but all over the world. Amazon, in the desert, and in the ocean.
3) If you preserve biodiversity, you WILL stay well fed. If Japan has an overpopulation of poison sea urchins that's killing the fish population, that's the worlds sea food population, so that means no more seafood. That is a great source of protein for not only Japanese people, but people all over the world. We can fix that easily by removing that sea urchin from the biome. Easy.
