Dramatic images of the Ohio train derailment and its aftermath gripped the world’s attention in February: a huge plume of thick, black smoke towering into the atmosphere; the blackened carcasses of railcars on their sides, scattered in an unnatural formation; a land scorched and scarred from 50 rail cars, many carrying toxic chemicals, coming off the tracks.

Scientists have told E&T that it could be decades before long-term health impacts of the accident are fully understood. They are concerned about the release of carcinogenic chemicals into the atmosphere, as well as into the soil and potentially, the food chain.

However, the Ohio derailment was more than a one-off environmental disaster. The accident has lifted the lid on policies around hazardous chemicals, as well as corporate responsibility and environmental injustice.

Mike Schade, an expert from the group Toxic-Free Future, has been warning about the whole lifecycle dangers of polyvinyl chloride...