An average time for a plastic bottle to biodegrade fully is approximately 450-1000 years. However, there are many different kinds of plastic in the world, most commonly the hard and reusable ones, which take a longer time, and the soft and non-reusable ones, which take a shorter time. Time also varies with the size of the bottle. The obvious disadvantage is the length of time it takes plastic to break down as well as the harmful chemicals that will be released. You may find that in garbages 90% or more will be of plastics only. so its main disadvantage is its non bio degradable nature..and by some means if tried to burn it then it will create much envi pollution!! Advantages
The durability, strength, low cost, water and chemicals resistance, welding properties, lesser energy and heavy chemicals requirements in manufacture, fewer atmosphere emissions and light weight are advantages of plastic bags. Many studies comparing plastic versus paper for shopping bags show that plastic bags have less net environmental effect than paper bags, requiring less energy to produce, transport and recycle; however these studies also note that recycling rates for plastic are significantly lower than for paper. Plastic bags can be incinerated in appropriate facilities for waste-to-energy. Plastic bags are stable and benign in sanitary landfills. Plastic carrier bags can be reused as trash bags or bin bags. Plastic bags are complimentary in many locations but are charged or "taxed" in others.
The following disadvantages have also been identified:
Plastic bags are made of petrochemicals, a nonrenewable resource. Plastic bags are flimsy and often do not stand up as well as paper or cloth. When disposed of improperly, they are unsightly and represent a hazard to wildlife. Conventional plastic bags are not readily biodegradable in a sanitary landfill. Plastic bags can cause unsupervised infants to suffocate. They clog roadside drains, which could cause...
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