Plastic in the Ocean

Plastic pollution has become one of the most serious environmental problems of our time. An estimated eight million tonnes of plastic waste enter the world's oceans every year. If this trend continues, some scientists predict that by 2050 there could be more plastic in the ocean than fish by weight.

Most ocean plastic comes from land. Rivers carry plastic waste from cities and towns to the sea. In many developing countries, waste collection systems are inadequate, and large amounts of rubbish end up in waterways. Fishing nets, ropes, and other equipment lost or discarded at sea also make up a significant portion of ocean plastic.

The largest known accumulation of ocean plastic is the Great Pacific Garbage Patch, located between Hawaii and California. Despite its name, it is not a solid island of rubbish. Instead, it consists of a vast area of water containing high concentrations of tiny plastic fragments, spread across an area roughly three times the size of France.

Plastic pollution has devastating effects on marine life. Sea turtles mistake plastic bags for jellyfish and eat them. Seabirds feed plastic fragments to their chicks. Whales and dolphins become entangled in abandoned fishing nets. Scientists estimate that plastic pollution kills more than one million seabirds and 100,000 marine mammals every year.

Perhaps the most concerning development is the discovery of microplastics — tiny pieces of plastic less than five millimetres in size — in the food chain. Fish eat microplastics, and humans eat the fish. Microplastics have been found in drinking water, table salt, honey, and even in human blood. The long-term health effects are still being studied, but early research has raised concerns.

Efforts to clean up ocean plastic are growing. Organisations such as The Ocean Cleanup have developed systems to collect plastic from rivers before it reaches the sea. Beach cleanup campaigns mobilise thousands of volunteers around the world each year.

However, most experts agree that cleanup alone is not enough. Governments in over 120 countries have introduced bans or taxes on single-use plastic items such as bags, straws, and cutlery. The European Union has banned several single-use plastic products since 2021. Reducing plastic production and improving waste management are essential if we are to protect our oceans for future generations.