Fishing and port activities generate significant amounts of solid waste, which is often dumped directly into the marine environment. Where treated, this is often using inadequate generic treatments along with domestic waste. Three of the most environmentally damaging inorganic solid wastes are fishing nets, expanded polystyrene, and batteries/lighting devices. Abandoned and mismanaged nets negatively impact marine ecosystems and kill fish - ghost fishing - and other wildlife through suffocation or strangulation. Waste equipment can trap and poison marine life, especially if composed of plastics that last between 50 and 450 years (and even longer for expanded polystyrene). Batteries, which are increasingly used on boats, are all-too-often dumped at sea causing chemical pollution and poisoning marine organisms, and can remain a pollutant for very long periods of time.