nas are increasing their rate 
of growth explosively and are sort of taking over the canopy of the 
rain forests.
  So when we went up there, you could see these places where the canopy 
of the rain forest was just covered with vines. He told me that 25 
years ago that was simply not the case. So what we are seeing is major 
changes in vegetation patterns in certain places associated with carbon 
dioxide as well.
  So what do we conclude from this? Well, I think that we need to 
exercise common sense. What 