The Microplastics Crisis
Microplastics — plastic particles smaller than 5mm — have become one of the most pervasive environmental pollutants on Earth. Found from Arctic sea ice to the deepest ocean trenches, from mountain soils to human blood, microplastics represent a welfare threat to animals across virtually every ecosystem. Estimates suggest over 8 million tonnes of plastic enter the ocean annually, fragmenting over decades into billions of micro- and nanoplastic particles that animals across food webs ingest.
8M
Tonnes plastic entering ocean annually
700+
Marine species affected by plastic
90%
Of seabirds have ingested plastic
100%
Of sea turtles tested contain microplastics
Welfare Impacts on Marine Animals
Seabirds
Seabirds are among the most severely affected groups. Albatrosses, petrels, shearwaters, and many other species mistake floating plastic for prey. Documented welfare impacts include:
- Physical blockage of digestive tract causing starvation — a slow, painful death
- False satiety — birds feel "full" from plastic without receiving nutrition; chicks fed plastic by parents may starve
- Internal lacerations from sharp plastic fragments
- Toxic chemical exposure from plastic-absorbed pollutants (PCBs, DDT, phthalates)
- Reduced reproductive success from hormonal disruption
Sea Turtles
Sea turtles are highly vulnerable to plastic ingestion — floating plastic bags resemble jellyfish, a key food source. Beyond ingestion, entanglement in plastic debris (ghost fishing gear, packing straps) causes drowning, injury, and chronic wound infection. Studies find 100% of sea turtles sampled contain microplastics in their tissues.
Cetaceans (Whales and Dolphins)
Sperm whales and beaked whales have been found stranded with stomachs containing hundreds of kilograms of plastic — causing starvation and intestinal blockage. Microplastics are detected in dolphin and whale tissue, with unknown long-term toxic effects. Ghost fishing gear entanglement is a significant cause of cetacean injury and death globally.
Freshwater and Terrestrial Wildlife
Freshwater Systems
Freshwater systems — rivers, lakes, and wetlands — are heavily contaminated with microplastics from urban runoff, laundry wastewater, and river transport from inland areas. Freshwater species affected include:
- Fish ingesting microplastics and passing them to predators up the food chain
- Amphibians showing developmental disruption from microplastic exposure during vulnerable larval stages
- Freshwater mussels and bivalves accumulating high microplastic loads
- Aquatic invertebrates at the base of food webs showing reduced reproduction and survival
Terrestrial Wildlife
Emerging evidence: Microplastics are now detected in terrestrial ecosystems including soil, where they affect earthworms, soil microbiota, and the plants animals depend on. Birds of prey, raptors, and songbirds show microplastic accumulation. The full welfare implications for terrestrial wildlife are still being investigated.
Farm Animals and Microplastics
Farm animals are increasingly exposed to microplastics through contaminated feed, water, and soil. Research findings include:
- Cattle, sheep, and pigs consuming plastic-contaminated pasture or feed show microplastic accumulation in meat and organs
- Dairy cows' milk contains microplastics — raising questions about both animal welfare effects and human health
- Poultry feed and water sources are contaminated; microplastics found in chicken meat and eggs
- Fish in aquaculture systems exposed to microplastics through feed containing marine-derived ingredients
Known Welfare Effects on Farm Animals
- Inflammation at tissue level from micro- and nanoplastic particle accumulation
- Potential endocrine disruption affecting reproduction and growth
- Gut microbiome disruption affecting digestion and immune function
- Carrier effects — microplastics adsorb and transport persistent organic pollutants into animal tissue
What Can Be Done
Policy Actions
- Global Plastics Treaty — ongoing UN negotiations for legally binding plastic reduction commitments
- Extended producer responsibility making plastic producers fund collection and cleanup
- Single-use plastic bans covering highest-impact items (bags, straws, packaging)
- Microplastic filters for washing machines (synthetic textiles are a major source)
- Improved wastewater treatment to capture microplastics before discharge
Individual Actions
- Reduce single-use plastic use, particularly items that escape recycling (bags, wrappers, bottles)
- Wash synthetic clothing less frequently and use microplastic-catching laundry bags
- Support organizations advocating for plastics regulation and cleanup
- Participate in local cleanup events that prevent plastic reaching waterways
- Choose products with minimal or recyclable packaging
The microplastics crisis is a systemic problem requiring systemic solutions — individual action matters but must be accompanied by policy change and producer responsibility to achieve the scale of reduction needed to protect animal welfare globally.