In parts of Russia on the Desna River, where pollution is a major problem, some quick-thinking environmentalists/travelers/campers have devised a way to kill two birds with one stone: clean the banks of the river while building a raft to float it.
EnglishRussia — one of my favorite blogs — has a photo gallery showing a group of kids stuffing rubbish into trash bags and attaching them to the bottom of a large, flat, wooden boat-like contraption. The bags filled with trash give the wood enough buoyancy to support the weight of five people and a tent. This makes me feel all warm inside.
Check out EnglishRussia for the full gallery.