Finding the space for wind turbines in urban areas is difficult—even for vertical turbines like Mariah Power’s Windspire. But a new design from Sridhar Condoor could drastically reduce the space requirements for wind turbines. Condoor’s turbine is hollow, cylindrical, and lacks a central hub. Its hollowness allows it to be placed around existing objects— so you could literally have a tree-hugging turbine.

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