The science is unsettled, but researchers say there is cause for concern
, a biochemist at Utah State University who studies how dust transports nutrients, pathogens, and contaminants, says she is concerned because plastic production continues to increase dramatically, while so much about microplastics remains unknown. In 2020, 367 million metric tons of plastics were manufactured, an amount that is forecast to triple by 2050.
The ACC also criticized that finding, saying, “The amount of microplastics in the environment represents only 4 percent of particles collected on average… The other 96 percent is comprised of natural materials like minerals, dirt and sand, insect parts, pollen and more.” In the decade since, the numbers and risks to animals have worsened. More than 700 species are affected by plastics. It is probable that hundreds of millions of wild birds have consumed plastic, scientists say, and by mid-century, all seabird species on the planet are predicted to be eating it. Certain bird populations are already thought to be threatened by widespread exposure to endocrine-disrupting chemicals contained in plastics.
Hardesty, one of the co-authors, says the quail study serves as a cautionary reminder that assessing the threat posed by exposure to microplastics is “not that simple.” In particular, she says, the difficulty finding clear evidence of harm in quails “really highlights that we are still not able to answer the question of what the impact of eating plastic is for humans in a definitive way.
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