Question

Why is polystyrene not environment friendly?

Answer 1

As it is not easily decomposed.
It takes millions of years which is not a reasonable period of time since human race could even end by that time thus polystyrene is not environment friendly

Answer 2

Styrofoam is made from polystyrene, which is a petroleum-based plastic. Styrofoam is actually the trade name for polystyrene. It's popular because of its light weight, good insulation properties, and advantage as a packing material for shipping without adding weight.