Student sample for assessment
Written by a Year 8 student in Cairns, Queensland, Australia.
The Great Barrier Reef is the world's largest coral reef system, stretching nearly 2,300 kilometres along the Queensland coast. It consists of almost 2,900 individual reefs, making it one of the most complex ecosystems on Earth. These reefs support an extraordinary diversity of life, including around 1,500 species of fish and countless other creatures. The reef was recognised as a UNESCO World Heritage Site in 1981, reflecting its global importance. For Australia, the reef generates significant economic value, with tourism contributing approximately $6.4 billion to the economy each year. However, the reef now faces serious threats from multiple directions. Rising ocean temperatures have triggered mass coral bleaching events in 2016, 2017, 2020, and 2022, with another major event in 2024. When water temperatures become too warm, corals expel the algae that gives them colour and keeps them alive, a process known as bleaching. Ocean acidification is another problem: as the ocean absorbs carbon dioxide from the atmosphere, the water becomes more acidic, making it harder for corals to build their skeletons. Additional pressures come from crown-of-thorns starfish, which eat coral, and agricultural runoff that clouds the water and reduces light available to corals. Protection of the reef involves a multi-layered approach. The Great Barrier Reef Marine Park Authority, or GBRMPA, manages the reef and works to minimise human damage through zoning and regulation. Scientists are exploring innovative techniques like assisted evolution, which involves developing heat-resistant coral varieties that might survive warming oceans. The Australian government funds reef protection programs aimed at reducing local stressors. However, the hard truth is that without significant cuts to global carbon emissions, these efforts alone cannot prevent large-scale damage to the reef in the coming decades.