Nature
Some plastic is virtually indestructible: it resists dissolution by water, air or sunlight, is unpalatable to the microorganisms that break down natural materials and burning it gives off noxious gases.
Incidence
Bis-phenol-A is a breakdown product of polycarbonate plastics (hard plastics used to make, for example, water jugs). It is a mimic of the female hormone oestrogen and may be causing biological contamination which affects mammalian sexual functioning.