Due to exposure and wear and tear, big plastics inevitably break down into smaller pieces. Microplastics are pieces of plastic that measure up to 5 millimetres on their longest dimension. (The definition includes nanoplastics, which are even tinier particles.) Hard to detect and hard to control, these pollutants have been proven, in controlled experiments, to harm both the environment and living creatures. So far, the high concentrations simulated in laboratories have not yet been found in nature. Yet, given the limitations of the current measurement methods and the fact that many human activities (agriculture, fishery, industry, and others) continue to release microplastics into the environment, this is no reason for relief.

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