Another threat to sharks and other marine species is trash and other pollution. With the massive plastic gyres around the world sharks and other marine life can mistake garbage for food or become entangled in floating debris. Plastic is also often consumed by the marine species that sharks eat, So sharks will eventually consume non-food products which can lead to illness and death. Industrial pollution and the dumping or discharge of chemicals into the ocean especially around coral reefs, sea grass beds, and mangroves kills shark foraging habitats and potential shark nurserys. Pollutants are also absorbed into the systems of many species (and humans) and as an organism is consumed by subsequent predators the top predators bio accumulate high levels of toxins which can have reproductive and other health implications.
Industrial fisheries often lose fishing lines and nets that continue to kill essentially forever. So please consider what your consumer choices are supporting and what their impact is on the environment.
Organize a reef, beach, stream, river, or park clean up and carefully remove fishing line from corals wherever possible to help prevent entanglement. Every effort adds up.
Use a reusable water bottle, reusable bag, and other reuse items as much as possible so that they don't end up harming nature.