In the hills north of San Francisco, a new form of farming is taking root. It's called biointensive farming, and it has the potential to give small farmers a much bigger impact on the global food supply.
New York City drew the reservoir down to an unprecedented level last winter — but only because forecasting told city official that it would soon be able to refill with an unprecedented amount of snowmelt.
Some plants do better at responding to drought the second time around. Scientists want to figure out how they "remember" — and if there's something we can do for other types of plants to give them a similar benefit.