"In the past, when one civilization collapsed, others evolved to replace it. Today the world-wide agroindustrial complex is making unprecedented demands on the whole earth’s biological ecostructure. After a brief half-century in which factory farming enlarged the meagre diet of the poor (though not for all, nor always to their benefit), the multinational food industry has become a primary impetus towards overpopulation, obesity, pollution, and global warming. Policies and practices whose effects were once circumscribed are now a threat to human survival."