As people look into the future, more radical schemes have been proposed for reducing the amount of greenhouse gases. One of the geoengineering concepts proposed by the U.K. Institute of Mechanical Engineers is to have algae farms growing in urban buildings. In theory, these urban farms would be able to generate energy on site.
March 5, 2012 3:59 AM PST
Photo by: U.K. Institute of Mechanical Engineers
| Caption by: Martin LaMonica
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