admittedly on a tiny scale but if everyone did it . . .
We have become slightly obsessed with second-hand yogurt-makers - they turn up at all junk emporiums and boot sales/vide greniers, usually sporting a fine 1970s livery of orange/red/mustard etc.
We have three now - one mid-yellow one that cost two euros in a local boot-sale, a large circular mustard-coloured one which is only suitable for really for large yogurt events (?) and our new find: orange-red, called SEB and fitted with a pleasing smoke-coloured plastic lid. This is definitely the best yet - a fine, even yogurt and just the right sized jars and it only cost THREE euros!
We haven't purchased yogurt in plastic pots for years now, and at a rough estimation, if we had, and had kept them all for some weird reason, there would be probably enough to fill the kitchen or at least the shed.
Having seen yet another distressing bit of film this morning about whale death due to plastic, one of the many, many answers is to make more stuff at home and buy less packaging - washing up stuff/shampoo etc, 'loose' from bio shops, fizz-up tap-water with a soda stream and of course, the yogurt-maker - pint of milk (bio works best), a bit of the last yogurt to get it going, or a small sachet of 'culture powder' (wonder what other sorts of culture could be dried and reanimated . . .) a minuscule bit of electricity and off you go . . .