People didn't starve in Scotland and Ireland through the early 19th century because of the one virus that destroyed one crop, it was because everyone was exporting all the food they could to pay ever increasing taxes, the potato blight was just the last straw. Only now we have no where else to go, so get creative and grow your own food even if it's hydroponics or earthworms in the basement. China is in a multi-year drought and has depleted their aquifers trying to grow three crops a year, so are buying up land and food exports in South America and Africa, and by selling them food and energy supplies in record numbers Obama can claim he has boosted the GDP and export numbers.