Remember how your parents used to remind you to go to the toilet just before leaving home on a trip? Well, now All Nippon Airways is doing the same thing—urging passengers to visit the restroom before flying as part of its new ecological measures. The airline estimates that if half its passengers went to the bathroom before boarding, it could reduce its carbon dioxide emissions by 4.2 tons a month. ANA will also recycle paper cups and plastic bottles, and use chopsticks produced from wood from forest-thinning projects. The move is the latest in a series of steps by airlines to reduce the weight of flights, which have included trimming the size of in-flight magazines, slimming the handles of forks and spoons, and using lighter drink trolleys and porcelain.