Greenpeace activists protest against the US policy on nuclear weapons during a visit by US President George W. Bush to Mainz, Germany. Activists in inflatable boats are on the Main, where they display a banner reading: "No Nuclear Weapons in the USA and Elsewhere - No more wars, Mr. Bush!" President Bush is meeting German leader Gerhard Schroeder in Mainz to discuss bilateral ties and tensions with Iran, the reconstruction of Iraq and reform of Nato.