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To reduce the size of the plumes,the EPA plans to use chemical oxidation to reduce and degrade volatile organic compounds, including chlorinated ethene and trichloroethylene, both of which have been linked to cancer.

Chemical plants break down long hydrocarbon molecules in crude to produce a smorgasbord of smaller molecules, such as ethene, propene and benzene — all important precursors to polymers.

Global annual production of ethene and propene exceeds 200 million tonnes, about 30 kilograms for each person on the planet.

You end up with ethene, which is also known as ethylene.

The US chemical industry has also benefited from cheaper feedstocks, such as ethene, giving it a competitive edge over other regions.