Global bottled water giants are ramping up trials of easily recyclable aluminum cans to replace plastic that pollutes the world's seas. Sound like a slam-dunk for the environment? Not entirely.
Aluminum cans might indeed mean less ocean waste, but the production of each can pumps about twice as much carbon into the atmosphere as each plastic bottle.
French group Danone has become the latest company to make a move, saying it has started to replace some plastic bottles with aluminum cans for local water brands in Britain, Poland and Denmark.