plastics are threat to environment.comment.
Plastic is non-biodegradable because its decomposition is not possible by natural processes. Also, there is no estimated figure of the time required for its decomposition. Such non-biodegradable substances are hazardous for our environment. Though Plastic is an essential part of our day-to-day life, it is very harmful to our environment. It causes environmental pollution. Since natural processes do not decompose plastic easily, burning this waste is an option for its disposal.
However, the burning process of plastic (and all other synthetic materials) is quite slow and incomplete as well. Also, the process of burning involves the release of various poisonous gases causing air pollution. Hence, the problem of plastic disposal remains unsolved.
Hope now you have got the point tat why plastics are considered as threat o environment.
All the best !!