Britain's largest supermarket chain, Tesco , is set to introduce decomposable packaging this month, a initiative which, it claims, could transform waste management across the country. Bulk waste is generally burned or buried in huge toxic landfill sites, but Tesco's new "bio packs" decompose when exposed to wind, rain and air, turning into harmless garden waste. The bio-packs will be trialled on organic fruit and vegetable products to start with, but