Oceans cover more than 70% of the Earth's surface and are home to a diverse array of marine life. Coral reefs, often referred to as the "rainforests of the sea," support thousands of species. However, human activities, such as overfishing, pollution, and climate change, threaten marine ecosystems. Plastic waste is a significant pollutant, with millions of tons entering oceans yearly. Conservation efforts include reducing plastic use, establishing marine protected areas, and promoting sustainable fishing practices to protect marine biodiversity.