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Given how valuable space is in New York City, the city's rooftops are strangely empty. But a proposal from the city's planning department could change that by making 1,200 acres of commercial rooftops available for urban farmers to open greenhouses across the city. City law imposes restrictions on how tall buildings are allowed to be in different areas, which is one reasons why rooftops stay empty - developers often build to the maximum height possible. The planning department's proposal would allow buildings to add rooftop greenhouses above regular height restrictions. And according to a study from the Urban Design Lab, that would mean 1,200 acres of empty, flat rooftops would be eligible for green penthouses. Besides the promise of fresh, city-grown vegetables (and fresh city-grown jobs), creating greenhouses up on these roofs has another benefit for New York. Rooftop greenhouses will be required to incorporate rainwater collection and reuse systems, which will help the city mitigate the pressure that big rainstorms puts on the sewer system.

The market for local food - food that is produced, processed, distributed and sold within a specific region, say a radius of several hundred miles - is growing. Large, small and midsized farms are all tapping into it. Even better, new data suggest that these producers are employing more workers than they would be if they weren't selling into local and regional markets.

Global food prices will more than double within 20 years as a new age of crisis forces the collapse of our broken global food system, said Oxfam today. The international development agency said Europe is sleepwalking as the world enters into an unprecedented and avoidable reversal in human development.

Farmers markets have grown in popularity as the consumer demand for locally grown and produced foods has grown, said Lori Panda, who runs the Ohio Proud program of the Ohio Department of Agriculture. The program oversees the state's more than 1,000 farmers markets. In comparison, 600 were listed with the department in 2006, Panda said. As their numbers increase, farmers markets are popping up in not-so traditional locations. "The markets are opening in places like Easton because it has a ready-built clientele," Panda said. "It's not surprising, considering the growing interest of consumers who want more options for local foods, want to support the local economy, and, because of food-safety concerns, want to know who is growing their foods. It just makes sense that farmers want to go where the people are."