Bronte Wells
The Great Barrier Reef, one of the world's seven natural wonders, is under threat from climate change, rising temperatures, and human interference. While climate change remains the biggest threat, water pollution is also a significant issue, with poor water quality posing a grave risk to the reef's health. The primary source of pollution is runoff from farms, with pollutants such as fertiliser, pesticides, and sediment making their way into the reef and causing algal blooms, coral bleaching, and reduced light availability. Rivers like the Burdekin, Burnett, and Fitzroy are major contributors, with their runoff impacting hundreds of reefs. To protect the reef, addressing water pollution and reducing land-based pollutants are crucial, and efforts are being made to improve water quality and farming practices in the region.
| Characteristics | Values |
|---|---|
| Type of pollution | Water pollution, nutrient pollution, sedimentation, nitrogen pollution, mud pollution, inorganic nitrogen pollution, copper pollution |
| Source of pollution | Rivers, farms, agriculture, cattle grazing, cotton growing, dairy farms, horticulture, sugarcane farming, cropping, overfishing |
| Specific rivers | Daintree River, Burdekin River, Burnett River, Fitzroy River, Herbert River |
| Specific companies | Queensland Nickel |
| Impact | Coral bleaching, reduced coral diversity, reduced resilience to bleaching, reduced seagrass growth, risk to marine plants and animals, reduced light, smothered corals |
| Prevention | Queensland government passed a bill to improve water quality, reducing fine sediment, improving livestock management, banning commercial gill net fishing |
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What You'll Learn
Agricultural pollution
The Great Barrier Reef is vulnerable to multiple threats, including agricultural pollution. Grazing lands and sugarcane crops are the main contributors of fine sediment and excess dissolved nutrients and pesticides on the Reef.
Excessive fertiliser applied to crops, like sugar cane, can wash into rivers and waterways, and ultimately out to the Great Barrier Reef. Nitrogen from these fertilisers is linked to harmful algal blooms, which can block sunlight, reducing corals' resilience to bleaching and coral diversity. Algal blooms can also reduce the amount of light available for seagrasses to grow and be healthy. Pesticides and herbicides have been detected in high concentrations in inshore areas and pose a further risk to marine plants and animals. Herbicides inhibit the growth of non-target plants, such as seagrasses, on which dugongs, turtles and fish depend.
Tree clearing and overgrazed grasslands cause soils to erode and wash into creeks and rivers that run into the Great Barrier Reef. Sediment discharged from rivers reduces sunlight available to seagrasses and corals, which can smother coral and seagrass growth. Silt and clay can literally smother corals, either by covering them in a blanket of fine particles or by clouding the water and hindering photosynthesis. Sedimentation runoff reduces the clarity of coastal waters and restricts the growth of light-dependent plants and animals, including corals.
In 2019, the Queensland government passed a bill to improve water quality flowing into the Reef from agricultural properties. The new regulations target practices that pose the greatest risk for water quality, such as farmers who are overusing fertiliser and polluting the Reef. Since 2019, farmers have saved 36.2 metric tons of dissolved inorganic nitrogen from entering the Great Barrier Reef. This has resulted in improved water quality that reduces the risk of biodiversity loss among corals.
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Tree clearing and overgrazing
The Statewide Landcover and Trees Study (SLATS) data revealed that hundreds of thousands of hectares of land are still being cleared in Queensland, with nearly half of the clearing occurring in Reef catchments. Despite the Queensland Government introducing legislation in 2018 to curb tree clearing, full clearing, where less than 10% of tree cover remains, has increased in these areas.
World Heritage advisory body UNESCO has urged the Queensland and federal governments to strengthen controls to stop tree clearing, particularly in high-priority areas, including vegetation along watercourses. Tree clearing exacerbates climate change by adding to carbon pollution when trees are burned or left to rot, and removing trees that could absorb carbon from the atmosphere.
Overgrazing, particularly in the form of sugarcane and grazing in regional Queensland, is another significant contributor to the pollution of the Great Barrier Reef. Overgrazing can lead to soil erosion and increased sediment runoff into the Reef. Additionally, overgrazing can result in the overuse of fertiliser, which can wash into rivers and waterways, ultimately flowing out to the Great Barrier Reef.
To protect and restore the health of the Great Barrier Reef, it is crucial to address the issues of tree clearing and overgrazing through stricter regulations and sustainable land management practices.
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Nitrogen and fertiliser runoff
The Great Barrier Reef is a delicate ecosystem that is under constant pressure from various pollutants, including nitrogen and fertiliser runoff. Nitrogen, a crucial element in agricultural fertilisers, has been linked to harmful algal blooms in the reef. These algal blooms block sunlight, reducing the resilience of corals to bleaching and negatively impacting coral diversity. The excessive use of fertilisers on crops, such as sugarcane, leads to runoff that eventually finds its way into the reef. This runoff contains high levels of nitrogen, contributing to the algal blooms and disrupting the natural balance of the ecosystem.
The Daintree River has been identified as one of the major contributors to nitrogen runoff onto the coral reefs. Research has revealed that pollutants from this river can impact reefs up to 450 kilometres away. The Burdekin River is another significant polluter, affecting 275 reefs during 2011. Understanding the flow of these pollutants is essential for devising effective strategies to protect the reef.
Queensland, with its agricultural activities, plays a crucial role in the health of the Great Barrier Reef. The state has implemented regulations to address the overutilisation of fertiliser by farmers, recognising the impact of their practices on the reef. However, there is still a long way to go to achieve the desired targets. For instance, according to a 2015 report, only 23% of sugarcane land was managed using best management practices, falling short of the Reef 2050 goal of an 80% reduction in dissolved nitrogen loads from agricultural runoff by 2025.
To address this issue, innovative approaches are being explored, such as the Sugar vs the Reef project. This project aims to inspire environmental stewardship within the farming community by engaging artists to spark conversations about the complex social and environmental aspects of agriculture. Additionally, initiatives like the Smartcane Best Management Practice (BMP) Guidelines have been established to encourage sugarcane growers to adopt sustainable farming practices that reduce runoff impacts on the reef.
While climate change remains the most significant threat to the Great Barrier Reef, tackling water pollution and nutrient runoff is entirely within our control. By improving farming practices, reducing fertiliser use, and managing livestock effectively, we can minimise the impact of nitrogen and fertiliser runoff on the delicate ecosystem of the Great Barrier Reef.
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Climate change
Coral reefs are a combination of plant and animal parts, with soft bodies that harbour algae that rely on light for photosynthesis. Climate change-induced ocean warming and acidification directly impact the health of corals, making them more susceptible to bleaching. Bleaching occurs when corals become stressed due to changes in water temperature, salinity, nutrients, or other factors, causing them to expel their symbiotic algae and turn white. This loss of algae not only affects the reef's vibrant colours but also its ability to produce food, making it more difficult for the corals to recover and survive.
The Great Barrier Reef has experienced multiple mass bleaching events in recent years, with the fifth event in 2024 feared to be the most widespread and damaging. This crisis highlights the urgent need to address climate change and stop burning fossil fuels to protect coral reefs worldwide. The reef's decline has significant consequences for the thousands of plants and animals that depend on it, as well as industries such as tourism, fishing, recreation, research, and education.
While climate change remains the biggest threat to the Great Barrier Reef, human activities also play a significant role in its deterioration. Water pollution, coastal development, and human interference have disrupted wildlife and destroyed habitats. Poor water quality, primarily from agricultural runoff and river discharges, smothers corals and seagrass beds, blocking sunlight and driving population explosions of invasive species like the crown-of-thorns starfish. Additionally, unsustainable fishing practices, ship traffic, and noise pollution further endanger the reef's delicate balance.
To protect and preserve the Great Barrier Reef, addressing climate change must be a top priority. This includes reducing the burning of fossil fuels, implementing stronger nature laws, and mitigating the impacts of rising temperatures and ocean acidification. Additionally, tackling water pollution through improved land management practices, reducing fertiliser use, and regulating industrial pollutants are crucial steps towards conserving this iconic World Heritage Area.
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Pollution from ships and plastic
The Great Barrier Reef, located off the coast of Queensland, is one of the world's seven natural wonders and a UNESCO World Heritage Site. It is the largest coral reef system and the biggest living structure on Earth, attracting millions of tourists every year. However, the reef is under significant pressure from various threats, including pollution from ships and plastic debris.
Ship traffic contributes to noise pollution, which can disrupt the communication and navigation of marine animals in the reef. Additionally, ships can collide with marine creatures, leading to injuries and fatalities. The loss of approximately 3,500 shipping containers at sea each year poses a significant threat to the reef and marine life. When these containers are lost, they become marine debris, creating a navigation hazard for vessels and increasing the risk of collisions with the reef.
Plastic pollution is another critical issue facing the Great Barrier Reef. Plastic does not break down naturally but persists in the environment, breaking into smaller and smaller pieces over time. These microplastics can be consumed by marine animals, potentially releasing toxic chemicals that can harm their health. Plastic pollution also negatively impacts the aesthetics of the reef, affecting tourism and the enjoyment of this natural wonder.
To address plastic pollution, individuals, industries, and governments must work together. Single-use plastic items, such as straws, coffee cups, and plastic bags, should be replaced with reusable alternatives. Recycling and proper waste management, including beach clean-up initiatives, are also crucial in reducing plastic pollution. The Queensland Government has implemented a ban on single-use plastic bags and a container refund scheme to encourage recycling.
Collaborative efforts between organisations such as the International Coral Reef Initiative and the Commonwealth Clean Oceans Alliance are vital to guide actions and mitigate the impacts of marine debris on the Great Barrier Reef. By prioritising sustainable practices and stewardship, we can minimise the threat of plastic pollution and ship traffic on this fragile ecosystem.
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Frequently asked questions
The Great Barrier Reef is affected by pollution from farming runoff, ships, and plastic. River discharges are the single biggest source of nutrients, with over 90% of this pollution being sourced from farms.
The Daintree River is one of the greatest runoff risks of inorganic nitrogen onto the coral reefs. The Burdekin River was the dominant polluter on 275 reefs in 2011, impacting reefs up to 450 km north of its mouth. Other polluting rivers include the Burnett, the Fitzroy, the Herbert, and the 14 other rivers that feed into the Great Barrier Reef.
River pollution has led to increased sedimentation, higher algal growth, and reduced light for coral reefs, seagrass meadows, and mangroves. This has resulted in coral bleaching and a decline in coral biodiversity.
Farming pollution is caused by excessive fertiliser and pesticide use, as well as overgrazing. Copper is also a common industrial pollutant in the waters of the Great Barrier Reef.
To reduce pollution, critical land-based actions must be prioritised, such as improving land management and maintaining plant cover to reduce sediment runoff. Queensland's government passed a bill in 2019 to improve water quality flowing into the Reef from agricultural properties, targeting practices that overuse fertiliser.
