Absolutely. A good case in point is the mountain pine beetle that we have in British Columbia and Alberta. We used to be able to deal with it because winters were cold enough that most of the population was killed off. They're not now, so they can reproduce. That's going to be true of lots of parasites and other things that we sort of take for granted, like the migration of birds and butterflies that are essential for pollinating plants. So it gets a bit complicated.
On November 22nd, 2007. See this statement in context.