Maii ution Plastic bags are difficult and costly to recycle and most end up on landfill sites where they take around 300 years to photodegrade. They break down into tiny toxic particles that contaminate the soil and waterways and enter the food chain when animals accidentally ingest them. But the problems surrounding waste plastic bags starts long before they photodegrade. Our planet is becoming increasingly contaminated by our unnecessary use of plastic bags. Big black bin liners, plastic carrier bags carrying advertising logos, clear sandwich bags and a variety of other forms are all polluting our environment. They're lightweight, handy and easily discarded. Too easily discarded. While they were rarely found during the 60s and 70s, their usage has increased at an alarming rate since they became popular during the 80s. Just take a look around you. Plastic bags can be seen hanging from the branches of trees, flying in the air on windy days, settled amongst bushes and floating on rivers. They clog up gutters and drains causing water and sewage to overflow and become the breeding grounds of germs and bacteria that cause diseases