Microplastics: From Oceans to Human Bodies with Dr. Scott Coffin, Environmental Toxicologist

·1 hr·5 clips

Brains of people who died in 2024 had significantly higher microplastic concentrations than those from 2016.

The episode begins with host Jessica Aldridge introducing the topic of microplastics, noting recent findings of accumulation in human brains and links to diseases like Alzheimer's. She interviews Dr. Scott Coffin, a research scientist at the California State Water Resources Control Board, who holds a PhD in environmental toxicology. Dr. Coffin explains that microplastics range from visible fragments to nanoparticles smaller than DNA, first documented in 1969. He describes his PhD research on plastics from the Great Pacific Garbage Patch, testing chemical transfer to seabirds. The discussion covers how microplastics shed from everyday items, such as when unscrewing bottle lids or washing synthetic clothing, releasing fibers into wastewater. Dr. Coffin outlines California's 2018 law mandating microplastics monitoring in drinking water, a global first. He distinguishes between exposure and hazard in risk assessment, comparing it to sharks. Key pathways include air inhalation from household dust, tire wear particles washed into waterways via stormwater, and heat from food packaging increasing shedding. A study in San Francisco Bay found stormwater contributed 300 times more microplastics than wastewater. Dr. Coffin reveals that some 'compostable' paper cups use sprayed-on microplastic coatings, potentially contaminating compost. He discusses impacts on agriculture, as biosolids from wastewater treatment spread microplastics to farms, disproportionately affecting disadvantaged communities. Research on mammals shows microplastics can cause oxidative stress, inflammation, and male reproductive harm. Recommendations include using air filters, avoiding heating plastic, and reducing single-use plastics. Dr. Coffin mentions his Plastiverse project, a repository for plastic pollution tools, and journals like Frontiers in Water for further reading. The episode concludes with calls for reduction and policy solutions.

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