Park benches aren't normally the stuff of diplomacy. But when Los Angeles and New York started talking about banning the use of uncertified tropical timber for benches, boardwalks and other city projects, Malaysia's diplomats took notice. With good reason: If these cities adhere to a new certification programme, it could be the thin end of a wedge that transforms the world timber trade. Under proposed new purchasing laws in both cities, preference would be given to wood certified by an international environmental organization called the Forest Stewardship Council.