I like Greenpeace's style. They've bought a plot of land bang in the middle of the proposed new runway at Heathrow. This means that as the owners of the land they will be directly involved in any legal wranglings resulting from the development. To support them you can sign up to be a joint owner of the plot. There's no financial outlay here, it just means you appear as a joint owner on the legal deed of trust. Clever stuff. Just click on the logo at the top to add your support and become a landowner!