No Blade of Grass

The film opens with a montage of pollution, which as implied by the narrator, is the cause of a virulent new disease arising in Asia, a virus that strikes all members of the grass family, including wheat, rice and maize. It spreads to Africa, Europe and South America, bringing starvation, anarchy and cannibalism in its wake. Hundreds of millions die. The Chinese use nerve gas on their own population, killing 300 million, in their desperate attempts to survive.