Climate activists sit in front of jets and ride bicycles on the tarmac to protest against environmental pollution from aviation at Schiphol Airport outside Amsterdam on Saturday. “We want fewer flights, more trains and a ban on unnecessary short-haul flights and private jets,” said Greenpeace Netherlands campaign leader Dewi Zloch. The environmental group says Schiphol is the largest source of carbon dioxide emissions in the Netherlands, emitting 12 billion kilogrammes annually. Hundreds of other demonstrators in and around the airport’s main hall carried signs saying “Restrict Aviation” and “More Trains”. Transportation Minister Mark Harbers told parliament last month that his office could not control growing private jet traffic, and the government is considering whether to include the issue in its climate policy.