Instapundit links to an interesting piece by Alan Boyle, a worthy science reporter, on the blight responsible the Irish potato famine 140 years ago. Apparently the parasite that caused it (Phytophtora infestans) is with us to this day and still wreaking havoc. The article also states the problem "may be exacerbated by global warming."
Which raises a question: given that the earth has gone through warming and cooling cycles throughout her history and still seems reasonably intact, isn't it possible that along with the many bad things associated with global warming there may be good things too? If so, why don't we hear about them?