Environmental group Greenpeace called on the European Union to ban short flights on routes where a train journey under six hours was available, in a sign of growing pressure on governments to take bolder steps to avert climate disaster. More than a third of the 150 busiest short-haul routes within the EU have a viable rail alternative with journey times that meet the test, including popular hops like Paris-Amsterdam, Madrid-Barcelona and Munich-Berlin, according to research published Wednesday, just days ahead of the COP26 climate summit.