Having just read about the different kinds of plastics being used in producing single-use containers, and then being thrown away, causing harm to the environment and the life that is in it, I wonder what is the proportion of the total petroleum from wells that is being used for making these non-biodegradable materials. At least with the huge quantity of CO2 from burning fuels, there is a gradual return of this gas and its absorption back into nature, but the plastics don't have this feature, so we may expect the quantity of these waste plastics to grow until we run out of oil!