Plastic bottles travel thousands of miles to Latin American shores

Turquoise beaches along the Pacific coast of Latin America are washing up with an unwanted cargo: plastic bottles from across the globe. A new study tracking the origins of this pollution has revealed something sobering — some bottles have journeyed thousands of kilometers before landing on these shores, and they're coming from as far away as Asia and Europe.

Researchers led by marine scientist Ostin Garcés-Ordóñez at the Smithsonian Environmental Research Center analyzed bottles collected across 10 countries, from Mexico to southern Chile. This is the first study to map plastic contamination patterns across such a vast stretch of the Latin American Pacific. "We analyzed bottles from cities, continental beaches, and islands, which allowed us to see contamination patterns we hadn't observed before," Garcés-Ordóñez said.

What makes this research distinctive is how it happened. Hundreds of citizen scientists — students, local educators, and community volunteers — did the fieldwork. In Costa Rica alone, dozens of students coordinated by marine scientist Juan Manuel Muñoz-Araya collected plastic from continental beaches. This grassroots approach, led by the Chile-based network Cientificos de la Basura (Litter Scientists), transformed what could have been an academic exercise into a community investigation.

Following the plastic trail

The bottles tell unexpected stories. Some originated from local communities and ships in the region. Others drifted across ocean basins from distant sources. The diversity of plastic types complicates the picture further — the researchers found polyethylene terephthalate (PET), high-density polyethylene (HDPE), and polypropylene (PP). Each material requires different recycling processes, which matters because Central America, with its dense populations and limited waste infrastructure, already struggles with basic separation of recyclable from non-recyclable waste. In Costa Rica, only five of the country's 84 municipalities have facilities that even attempt this sorting.

The study, published in the Journal of Cleaner Production, underscores something the research team wants to be clear about: this isn't a problem any single country can solve alone. Plastic pollution crosses borders and oceans. "It's a sobering reminder that plastic pollution is a global problem that requires international cooperation," Garcés-Ordóñez said.

What happens next depends on whether the momentum from this research translates into infrastructure investment and policy change. The data is now in place. The citizen scientists have done their part. What's needed is the harder work: upgrading waste management systems, making recycling genuinely viable, and reducing the flow of single-use plastic at the source.