Trains or buses are much less polluting than planes.
Elsewhere a video group in India produced a film which led to the closure of a polluting factory.
By burying human waste, there is also an increased risk of polluting the groundwater.
For a long time no carts or carriages were permitted to enter the city for fear of polluting and injuring the pavement, and the transport of goods was carried on in hand-carts.
A new top band 'hits ' the most polluting new models only £ 45 harder per year, no real disincentive for 4x4 drivers.