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The amount of chemical and/or particulate pollutants in the air on a global scale is a touchy subject with little cross-border agreement over the best way to alleviate the problem. This week alone, the U.S.

Welcome to the "Silicon Roundabout," which is luring young companies with government funding, Google-sponsored office space, and a new start-up competition. The start-up scene in London may not be as well known as the hotbeds of entrepreneurship in Silicon Valley or New York City, but it is striving to offer entrepreneurs looking to launch companies a buzzing business environment.