I don't know how much chance they have to change things, but there's a bunch of people at Crystal Palace, South London, busy writing new words to old tunes to make their protest about the destruction of the green site of Joseph Paxton's original Crystal Palace in order to build a multiplex. Sorry I can't give many of the words, but I gave the sheet back so others could join in. All I can recall is
"Ten green trees, growing behind the wall (2), And if one big chainsaw, should make one of them fall, there'll be nine green trees, growing behind the wall."
Has to be old tunes, so people can join in, but it seems to be an instinct.