REUTERS/Nicholas Roberts

The health risks of some of the products chemical companies sell will become an investment issue for those companies themselves, Jeremy Grantham says.

Grantham gained fame in the investment community for predicting both the tech and housing bubbles.

He predicts today's toxic chemicals will be banned in the coming years, and those consequences will play out in chemical firms' stock prices.

Visit Business Insider's homepage for more stories.

Toxic chemicals are an unseen health risk to people — and they're about to become a financial risk to the chemical companies who make them, and the investors who trade them.



That's according to Jeremy Grantham, who gained fame in the investment world for spotting the two most recent bubbles in US markets: tech and housing.



Grantham, now chief investment strategist at Grantham, Mayo, and van Otterloo, penned a letter on endocrine-disrupting chemicals February 6. Those chemicals impede humans' hormonal processes, and can limit the number of children people are able to have, he said.



For the companies that make products that use such chemicals, that's about to become a major problem: As the risks of endocrine-disrupting chemicals gain more attention, Grantham predicts there will be a widespread ban on a wide range of chemicals, "which constitute a major fraction of earnings for some chemical companies."



"It is clear to me that several chemical companies represent high levels of risk in this area, risks that are currently underestimated," Grantham said.



The chemical sector has trailed the S&P 500 over the last three years, returning 19.04% versus the S&P 500's 44.85%, according to Fidelity. So far this year, that trend has continued: The sector has lost 2.67% versus the S&P 500's 3.0% gain.

NOW WATCH: A big-money investor in juggernauts like Facebook and Netflix breaks down the '3rd wave' firms that are leading the next round of tech disruption