With the widespread use of plastic products, plastic waste has become an increasingly serious threat to marine ecosystems, making it a pressing issue in global environmental protection.
1. Longevity of Plastic Waste in Marine Environments
Plastic materials such as PE, PET, and PP are highly resistant to degradation under natural conditions. Once they enter the ocean, they can persist for hundreds of years without fully breaking down. Large plastic items like bottles and bags can float on the surface for years, obstructing navigation and potentially being mistaken as food by marine animals.
2. Microplastics Disrupt the Food Chain
Over time, large plastics break down into microplastic particles under the effects of seawater and ultraviolet radiation. These tiny particles are easily ingested by plankton, fish, and shellfish, eventually returning to human diets through the food chain and posing potential health risks. Studies show that microplastics can absorb toxic substances such as polycyclic aromatic hydrocarbons (PAHs) and heavy metals, threatening the internal organs of living organisms.
3. Direct Harm to Marine Life
Marine animals such as sea turtles, whales, and seabirds often mistake plastic bags, bottle caps, and other debris for food. Ingesting these items can cause intestinal blockages, starvation, and even death. Entanglement in plastic waste can immobilize animals or lead to drowning. Autopsies of marine mammals frequently reveal large amounts of plastic in their digestive systems, highlighting the widespread and severe nature of the problem.
4. Indirect Damage to Human Economic Activities
Marine plastic pollution also negatively affects industries such as fisheries, tourism, and coastal ecological systems. Polluted beaches, declining fishery resources, and the deteriorating quality of marine life have long-term economic consequences for human societies and the sustainable development of coastal regions.