The masses of plastic could starve deep-sea ecosystems and hard animals, scientists fear.
The study "highlights the magnitude of plastic pollution," a professor of conservation told Newsweek.
Starfish from the 1970s were found to have similar levels of microplastics as those from today.
Researchers analyzed stool samples from eight countries.
"It has become clear that microplastics are dispersing all over the world—in the water column, sediment, and marine animal diets—even reaching as far south as the pristine environments of Antarctica."
Around the world, one million plastic drinking bottles are purchased every minute. Up to five trillion disposable plastic bags are used every year.
Scientists found the ice contained up to 12,000 microplastic particles per liter.
Scientists do not know the true impact of consuming microplastics. However, there are concerns in some quarters that ingesting these particles may pose a risk to human health.
Fluorescent dye could be the answer to finding the ocean's missing plastics.
The Atlantic Meridional Transect expedition team will get up at 4am to spend 12 hours putting down nets.