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From Scientific American's Today in Science - "Plastics in the Jewels"

Researchers tested 23 human testicles and 47 dog testicles and found microplastics in every sample, including PET (polyethylene terephthalate) and PVC (polyvinyl chloride). The humans had three times more plastic in their testicles than the dogs did. They also found that dog testes with higher concentrations of certain microplastics tended to have lower sperm counts.

Why this matters: Scientists haven’t yet determined the impact of microplastics on human health, but evidence suggests that chemicals in plastics can disrupt hormone signaling in the human body. That could trigger broad health effects, notably reduced fertility. Microplastics have been found in seminal fluid, the placenta, stool, blood and breast milk.

What the experts say: The EPA could evaluate microplastics under the Toxic Substances Control Act. “And the thing about plastics is that their source is fossil fuels,” says Tracey Woodruff, an environmental health researcher at the University of California, San Francisco. “We have to reduce fossil fuel use anyway to address climate change—why not also stop companies from turning it into plastic?”
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