When the Toronto Star published a Greenpeace op-ed critical of nuclear power, Canada's largest nuclear lobby group was quick to defend its technology. "Nuclear is clean," declared Denise Carpenter, President and CEO of the Canadian Nuclear Association in her letter to the editor. The problem is, Ms. Carpenter is quite wrong. So wrong, in fact, that earlier this summer Advertising Standards Canada formally decided that ads by the Power Workers' Union making a similar claim were inaccurate, unsupported, and misleading.