Question

What are biodegradeable plastics do they harm the environment in any way?

Answer 1

pet,hdpe,pvc,pp,ps,ldpe

Answer 2

Biodegradable plastics are plastics that can be broken down by microorganisms (bacteria or fungi) into water, carbon dioxide (CO2) and some bio-material . It is important to note that biodegradable plastics are not necessarily made from bio-material  (i.e. plants).
Yes,
1.Need for Composters
The flipside of using biodegradable plastics is that there will be a need for industrial composters to turn them into composts and availability of the equipment in some countries can be a problem. Apart from the cost, not all countries have the proper equipment especially if this is not the priority of the government. In the end, the bioplastics that need to be processed will not be discarded properly.

2. Engineering Issues
These bioplastics are plant-based and this means that they come from organic sources from farms such as soybeans and corn. However, these organic plants are sprayed with pesticides which contain chemicals that can contaminate the crops and be transferred or included in the finished product.

3. Risk of Contamination
Biodegradable plastics should not be mixed with non-biodegradable plastics when thrown in garbage bins. The problem here is that not all people know how to segregate or distinguish bioplastics from other plastic types. Once these two types of plastics are mixed together, these bioplastics become contaminated and cannot be used anymore. Consequently, these contaminated bioplastics will end in landfills and add to the volume of thrash.
Biodegradable plastics are becoming popular these days because of the increasing awareness on global warming and environmental issues. Despite having disadvantages, it will help to focus on the benefits of using bioplastics and on educating the people on its importance and effects on a global scale.