Plastic bottles litter most of the world. There have been ongoing efforts to find methods to biodegrade PET, a very common plastic used for bottled water. British scientists have discovered an efficient way to get bacteria to "eat" PET plastic. Here's how it works.
Recycling of plastics is not a simple job. They must be sorted, not only by type but also by the flameproofing chemical that may be added. A Danish group has figured out an automated way to sort plastic garbage using a nifty camera and an algorithm. And pretty colors. Clever stuff.