If, like me, you were dismayed by the government's decision to build a third runway and sixth terminal at Heathrow Airport, then have a look at Greenpeace's campaign to stop it.
It's called 'Airplot' and basically they've bought a plot of land right where the new runway is planned, and they need our support to stop the build. You can sign up as a 'beneficial owner', just as over 20,000 others have so far (including me).
The more voices there are, the louder they are.
If you're wondering why the growth in flying is such a bad idea, this summarizes it nicely.