Biodiversity is a problem, particularly in the area of over fishing controversy and the difficulty in setting fishing polices between nations. Larger exotic mammals are also threatened, and of course there is the frightening problem of the resurgence of wheat stem rust. All serious topics for conservationists.
Unfortunately, the biodiversity issue is also a powerful Luddite magnet In fact for a brief time, after the Great Hole in the Ozone Crisis and before the rise of AGW, it was the Luddite issue of choice. I suspect with Climate Change losing steam it will return to the front burner with that group.
On biodiversity we're already seeing things like the following: