I totally agree with your point of view that everything that we see on the earth and the specially everything which is the creation of God can never be useless always but yes there are the things which are present on earth and they are made by human and they can be injurious for health because a human can never be perfect so the creation of a human can never be perfect and there is always something which is not beneficial for health when created by human as plastic is also created by human about which you have told that it is more than 5 grams in the body of human then it may cause diseases I agree with you completely.

You have also share with this about the antidote of plastic and this is polythene which is also I need recommended in the different areas of earth in which there is awareness between people so they don't use plastic because they know that it cannot be recycled and indirectly plastic waste are polluting the water in the rivers and oceans which are also not good for human as well as for wildlife.

Great effort made by you I wish you good luck