How Waste Affects Biodiversity and What We Can Do About It

Waste is more than an eyesore. Littered streets, polluted rivers and overflowing landfills are visible signs of a much wider environmental problem. Every year, people generate large volumes of waste, yet much of it is not managed effectively. In South Africa, more than 60% of waste has been reported as ending up in landfills. With service-delivery challenges and many major landfill sites approaching capacity, the pressure on communities and natural ecosystems continues to grow. Both terrestrial and aquatic biodiversity carry much of the impact.

Habitat destruction is one of the greatest threats to biodiversity, and pollution can make the damage worse. Chemical runoff, heavy metals and improperly discarded pharmaceutical products can contaminate soil. These pollutants may harm animals that live underground, as well as the micro-organisms that recycle nutrients and keep soil healthy. Plants can also experience reduced growth and reproduction, including crops on which people and the economy depend. Because plants support many other species, damage to soil can disrupt vital ecosystem services such as clean water, fertile land and natural flood control.

Water supports every form of life, but pollutants can leach into groundwater, contaminate rivers and acidify soil and water bodies through acid rain. In a drought-prone country such as South Africa, this can have far reaching consequences. The Western Cape’s 2018 “Day Zero” water crisis showed how vulnerable communities and the regional economy can be when water supplies are under pressure. Agriculture is a major part of the province’s economy and depends on reliable access to clean water, so pollution can threaten food production, livelihoods and job security.

Wildlife can be poisoned or injured when animals come into contact with waste. Some species become entangled in discarded fishing line and other debris, while others mistake plastic and litter for food. Toxic substances can also build up in organisms and become more concentrated as they move through the food chain—a process known as biomagnification. Plastic pollution presents an additional concern: over time, larger items break down into microplastics that may be ingested by fish, birds and people. Nutrient pollution can also trigger eutrophication and harmful algal blooms, reducing oxygen in the water and threatening aquatic life.

There is reason for hope. Initiatives such as the #DontBeTrashy Drive show how CapeNature, the Department of Environmental Affairs and Development Planning (DEADP), Soapbox and the wider public can work together to raise awareness and reduce waste in the environment. Everyone can contribute by using less, reusing and recycling materials, disposing of waste responsibly, and taking part in local clean-ups. By changing everyday habits and encouraging others to do the same, we can help protect biodiversity, safeguard water resources and support healthier communities.