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Told about the even higher cancer risk from the boat fuel ingredient, Merkley said in an email, “It remains deeply concerning that fossil fuel companies are spinning what is a complicated method of burning plastics, that is actually poisoning communities, as beneficial to the climate. We don’t understand the cancer risks associated with creating or using fuels derived from plastics.”

Merkley said he is “leaving no stone unturned while digging into the full scope of the problem, including looking into EPA’s program.”

He added, “Thanks to the dogged reporting from ProPublica we are getting a better sense of the scale and magnitude of this program that has raised so many concerns.”

The risk assessment makes it clear that cancer is not the only problem. Some of the new fuels pose additional risks to infants, the document said, but the EPA didn’t quantify the effects or do anything to limit those harms, and the agency wouldn’t answer questions about them.

Some of these newly approved toxic chemicals are expected to persist in nature and accumulate in living things, the risk assessment said. That combination is supposed to trigger additional restrictions under EPA policy, including prohibitions on releasing the chemicals into water. Yet the agency lists the risk from eating fish contaminated with several of the compounds, suggesting they are expected to get into water. When asked about this, an EPA spokesperson wrote that the agency’s testing protocols for persistence, bioaccumulation and toxicity are “unsuitable for complex mixtures” and contended that these substances are similar to existing petroleum-based fuels.

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