Plastic bottles : Next terrorist
Manufacturing plastic is resource-intensive and yields various nasty emissions that contribute to global warming and degradation of water quality. It's made from non-renewable resources, and for all intents and purposes, it never biodegrades (although some specialized variations have been made specifically to do so). Yes, we'll run out of oil eventually, but we'll always have our plastic garbage. Add to this the growing suspicion that plastic use may lead to serious health problems.