An environmental activist sits atop the Brandenburg Gate in Berlin on Sunday, May 29, 2011, after Greenpeace activists fixed a radioactive sign to the gate's Quadriga sculpture to protest the nuclear power policy of the German government. (AP Photo/dapd/Michael Gottschalk)

Photo by: Michael Gottschalk

An environmental activist sits atop the Brandenburg Gate in Berlin on Sunday, May 29, 2011, after Greenpeace activists fixed a radioactive sign to the gate's Quadriga sculpture to protest the nuclear power policy of the German government. (AP Photo/dapd/Michael Gottschalk)