Marine debris is any man-made item that does not belong in the ocean. It can directly harm ocean life through ingestion or entanglement, and indirectly by damaging coral reefs and beaches. It also poses economic costs through impacts on tourism, fishing, and navigation, and human health risks from injuries. Sources of marine debris include improper individual and industrial waste disposal, poor waste management by municipalities, and natural disasters. Reducing, reusing, and recycling can help address this problem by decreasing the amount of trash that enters waterways and oceans.