have also set up campaign groups; Birmingham Airport anti-Noise Group, and HACAN Clearskies at Heathrow, to represent themselves over local environmental issues arising from airport operations. Even the smallest of airports engaged in air transport operations; Gloucestershire Airport, has attracted organised opposition to its plans to extend the main runway there, and the umbrella group AirportWatch lists over 20 local airport campaign groups. See also Environmental effects of aviation Greenhouse gas emissions by the United Kingdom Flying Matters – industry coalition Hypermobility Plane Stupid Stop Stansted Expansion – pressure group Notes References Transport policy in the United Kingdom Environmental impact Environment of the United Kingdom Aviation and the environment Aviation Climate change in the United Kingdom