Loss of genetic diversity makes the food supply even more vulnerable to pests and disease

Audubon at Home: "A mere 10 to 15 species of plants and 8 species of livestock now account for 90 percent of the world's food production. This loss of genetic diversity makes the food supply even more vulnerable to pests and disease. "

I'm working at better understanding the issue of the organic vs "regular" food supply. This statement hit home for me...What are we as a species doing? Not thinking ahead, that seems painfully obvious!