Following steps can be taken to prevent marine pollution.
1.Oil spills should be controlled so that thw hole ocean doesn't becomes polluted.
2.Waste material should not be thrown in the water bodies.
3.Direct disposal of wastes in water bodies should be stopped.
4.Agricultural runoff and use of pesticides should also be controlled.
5.We should also prevent air pollution because as acid rain is caused by air pollution and acid rain is very harmful for water bodies.
6.Waste from factories and industries should not be directly disposed in water bodies.They should be treated before disposal.