Because of all the chemicals getting into oceans, seas, rivers, lakes and other bodies of water, it is getting polluted and it is a big problem because the sea creatures and there ecosystems are in danger. Not only is the sea creatures and there ecosystems/habitats are in danger, but wider biological communities are also being harmed. You may see brown or green water and think of it as normal but that is not what it's natural color should be, it should be blue water. All of the pollution is making the water dirty, of course water will get dirty, but the water is getting really dirty because of all of the pollution going on. Agriculture is one of the major sources that is causing water pollution. Also the fertilizers given to the crops for "better growth" are being washed into rivers and lakes, which pollutes the water.