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We hear a lot about the greenhouse effect and how it is affecting the earth. We asked the experts to show us how it works. Professor Jo Haigh from Imperial college, who is co-director of the Grantham Institute for Climate Change and the Environment, and her colleague Dr Simon Foster designed an experiment for us. Our environment correspondent Matt McGrath went to see. (Photo: The E.ON coal-fired power station in Gelsenkirchen, Germany. Credit: Martin Meissner/AP)