I agree that the sooner more genuinely sustainable and environmentally friendly solutions to freedom of travel are found the better.
But I wish these protesters would focus their passion at the right level.
All they are in demonstrations like this is a nuisance and alienate them selves from otherwise sympathetic observers which probably does as much harm to their intent as the good they think they are doing.
Perhaps they would be better off and safer (or not) taking their issue to downing street because if nuisance value is all they have then they'll get more coverage that way.
Asides which some protesters almost do it as a profession. When protest groups in local areas are caught on surveillance and the footage is watched by police the same people appear whether to be protesting be it fox hunting, cycling laws, or green peace.