What aspect of garbage disposal is a primary concern for marine environments?

The primary concern regarding garbage disposal in marine environments is the safety of marine life. When garbage and pollutants are disposed of in or near water bodies, they can have dire effects on ecosystems. Many forms of waste can be harmful to aquatic organisms; for instance, plastics can entangle wildlife or be ingested, leading to injury or death. Toxic substances from various types of waste can leach into the water, affecting not only the individual organisms but also the entire food web and ecosystem health.

While the cost of disposal, the appearance of water, and tourism revenue are important considerations, they don't have the same direct impact on the health and survival of marine species as the safety of marine life. Ensuring a safe environment for aquatic organisms is crucial for maintaining biodiversity and the overall health of marine ecosystems, making it a primary concern in discussions of garbage disposal in these environments.