Greenpeace activists climb onto the top of a Manchester-London plane after it parked at London Heathrow Airport's Terminal One and cover the tailfin with a banner that reads "Climate emergency NO 3rd runway" in protest against the airport expansion for short haul flights. Developed countries must take steps to ensure their carbon emissions are cut by the upper end of 25-40%, by 2020, as recommended by the Intergovernmental Panel on Climate Change, in order to avoid catastrophic climate change.