Scientists are some of the most outspoken critics of global warming, with an overwhelming majority of scientists seeing human activity -- such as the burning of coal -- as the main cause of climate change. Yet there are other areas where science is divided. One is over the degree to which our genes determine our lot in life. Radical scientist Steven Rose about the perils of the "new genetics." And Ted Nace reflects on a remarkable grassroots campaign in 2007 to keep coal plants from being built in the United States.