Dan Charles

A new study looks at whether we can feed the world without destroying the Earth. The answer is yes, but how to make it happen is complicated, and will require big changes in the way we practice agriculture.

A jumping gene called "Hopscotch" rejiggered corn's ancestor, teosinte, so instead of bushy branches, the plant started producing one strong central stalk, much like today's modern corn.

In sub-Saharan Africa, where agricultural productivity is lowest and food shortages are most common, "huge volumes of rainwater are lost or never used," says Alain Vidal, director of the Challenge Program on Water and Food, which commissioned the studies.