As grain supply is threatened, how long can we feed ourselves?
"...we live in a finely balanced situation where world food supply just about meets demand, with no reserve to cover further population growth. But the population will grow anyway, and the world's existing grain supply for human consumption is being eroded by three different factors: meat, heat and biofuels. For the sixth time in the past seven years, the human race will grow less food than it eats this year."
I would say 'food for thought' but that seems so trite.