A heap of coloured plastic bottles.

There’s no need to worry about your cat or dog: it’s polyethylene terephthalate, commonly known as PET, that German scientists are targeting.

The most widely produced plastic in the world has been found to break down in less than a day when exposed to an enzyme, or polyester hydrolase, called PHL7.

Although not all PET products are susceptible yet, the Leipzig-based researchers believe that technology using PHL7 to break down PET at a large scale could be ready in about four years.

Read more here: Plastic packaging might be biodegradable after all, say German scientists.