Soil pollution is also a major concern, both in industrial and developing countries. Pollutants such as metals and pesticides seep into the earth's soil and contaminate the food supply. Soil pollution cause major health risk to entire ecosystems. This type of pollution reduces the amount of land suitable for agricultural production and contributes to global food shortages. Dumping of industrial and domestic waste products much of the world's soil pollution, though natural disasters can also add to problem. In wealthy countries such as the US, protection agencies monitor the food supply. The public is generally warned before major health outbreaks occur. Developing countries do not have this luxury. Farmer is poor nations grow food in contaminated soil both to earn a living and to avoid starvation.