Natural Resources are of two main types, renewable and non-renewable. Renewable resources include wildlife and natural vegetation of all kinds. The soil itself may be considered a renewable resource, although severe damage is difficult to repair because of the slow rate of soil-forming processes. The natural drainage of waters from the watershed of a region can be maintained indefinitely by careful management of vegetation and soils, and the quality of water can be controlled through pollution control. Renewable resources are capable of being regenerated or replaced by ecological processes on a time scale relevant to their use. These resources, such as biomass or energy from animal traction. Non-renewable resources: they include fossil fuels and mined products. Energy supply in World combined resources by which the nations of the world attempt to meet their energy needs. Reference to energy needs may simply be to the demand for so many tones of coal, barrels of oil, cubic meters of gas and so on ; but consumers are usually less interested in qualities of fuel than in energy services that it provides.