The research by an international group of experts led by Rochman and Borrelle, consisted of an evaluation of the level of effort needed to achieve a global reduction target for plastic pollution of less than 8 million metric tonnes (MT).
The group first estimated that 24-34 million MT of plastic emissions currently enter aquatic ecosystems every year. They then modelled future scenarios using existing mitigation strategies: reducing production of plastic waste (which includes bans), improving management of plastic waste that is produced, and continuous recovery (i.e., cleanup) from the environment.
The researchers found that even with parallel efforts in all three solutions, the level of effort required within each is enormous: (1) a 25 - 40% reduction in the production of plastic across all economies; (2) increasing the level of waste collection and management to at least 60% across all economies - with a change from 6 - 60% in low-income economies; and (3) recovery of 40% of annual plastic emissions through cleanup efforts.
"To put that last number into people power, the cleanup alone would require at least 1 billion people participating in Ocean Conservancy's annual International Coastal Cleanup," says Borrelle. "This would be a Herculean task given this is 660 times the effort of the 2019 cleanup."
The researchers note, however, that even if the prescribed effort is realized, the world remains locked into an unacceptable plastic future.
"The global community must coordinate a fundamental transformation of the plastics economy, one that reduces the amount of virgin plastic production, and reimagines how we make use and dispose of plastic materials," says Rochman.
The research was supported by the National Science Foundation through the National Socio-Environmental Synthesis Center (SESYNC).