In the case that you brought forward, there were actually two causes of this increase in pine beetles. One was the fact that we planted a lot of lodgepole pine in British Columbia and in Alberta through forestry. I think we have created large monocultures that are actually much more susceptible to the pine beetle.
You're right in that scientists have also shown that when we get winter temperatures below -30°, it usually kills the beetles or reduces the number of beetles, and with climate change, it's getting warmer.
There were two factors, as you can see: survival of the beetles during the winter and the fact that there are a lot more pure lodgepole pines across B.C. That has created this epidemic.
Actually, this species was native to B.C. but not to Alberta, and it has crossed the Prairies because of this very large amount, and it's actually spreading toward the east and threatening all of the pines in Canada.
This is one example out of many other insects. As I said in my statement today, we shouldn't be worried about only fires; we should be worried about drought and about various types of insects that may not have been doing a lot of damage before but will do more damage now because the trees are getting weaker and becoming maladapted. We need to look at the question in a very broad way rather than just looking at one disturbance or one factor at a time.