Depletion of natural resources like water, fuel-air and soil produces competition among living organisms for the remaining portions and diminishes the quality of available resources. Some of the human activities reduce the quality of drinking water. Overuse of fossil fuels reduces their availability and also introduces harmful toxins into the water and the atmosphere. Deforestation and agricultural activities exacerbate erosion and cause soil contamination, which impairs the survival capacity of plants, and makes surrounding areas prone to flooding and environmental disasters.