Interesting article on projected food production and the interminable problem of feeding everyone.
The number of maize plants in a hectare has risen from roughly 40,000 to 90,000 in the past half-century. There must come a point where plants can no longer be sardined any closer together, stalk crushed against stalk. Similarly, at some point it may no longer be possible to persuade plants to put ever more energy into seeds. In animals biological limits are already clear: turkeys are so bloated that they can no longer walk; chickens grow so quickly that they suffer stress fractures.
