Forget peak oil. It’s peak water we should worry about, says Lester R. Brown. “Water is far more important than oil,” according to the prolific author, founder of the Worldwatch Institute, and now president of the nonprofit Earth Policy Institute. Brown, whose early warnings about the dangers of climate change and resource overuse have made him a respected elder of the environmental movement, focused on the looming water shortages while promoting his memoir, “Breaking New Ground: A Personal History,” the latest of his 50-plus books. He spoke Friday at the Harvard University Center for the Environment. His point: It’s not that we will run out of water to drink; it’s that we won’t have enough to grow the food to feed the world. “Water supply may be the principal constraint on the production of food. There’s a lot of land to produce food, […]