National Geographic's short article "Our Dwindling Food Variety":

http://ngm.nationalgeographic.com/2011/07/food-ark/food-variety-graphic#.Tlwb23Ps0kV.facebook

This doesn't strike me as such a good thing, because

1. I like many tasty varieties of veggies on my dinner table;

2. and fewer varieties seem to mean greater vulnerability to disease, pest, crop failure, etc. The potato quickly became the staple in some European countries, but because so few varieties were brought over the Atlantic from the New World, the farmed potato could get wiped out by a single strain of virus, etc. The Irish Famine was apparently such an example. I'm not a biologist. Am I being paranoid?

DB