I forget what is in that chapter specifically.
Jesus said that by ALL THESE signs that you would know that the end is near. So far, they have only shown that ONE of these signs has changed. It goes to the olive tree illustration that he used, knowing when spring is to be near.
If the four horseman of the apocalypse are used, point out that the second last one is food shortages. However, the single biggest health issue facing the western world is OBESITY. It just doesn't add up.