Introduction Sustainability can be defined as the ability to carry on with something or simply to endure .When this term is applied in ecological studies, “it describes how biological systems remain diverse and productive overtime” (Cunningham 13). A lot of evidence currently indicates that the world’s population is increasing at a very fast rate especially in the developing countries. This also means that the current population is almost going beyond the earth’s capacity to accommodate human beings. This high population growth rate is likely to strain further the already scarce resources. According to the 2008 report that was made by Footprint, there is already a 30% deficit on the resources needed to sustain human beings. Even though the world resources are getting depleted, we can still sustain the ecosystem of the world through the following measures. Human beings should strive to reduce environmental degradation. The scarce resources should also be utilized properly. Human beings can also diversify their resources. For example they can use other renewable sources of energy instead of relying much in fossil fuels. Renewable and non Renewable Resources A renewable resource can be defined as a resource which can be replaced through a natural process. Solar and wind energy are two common examples of resources that can be renewed. The industrial revolution has led to over exploitation of the renewable resources. A non renewable resource refers to those natural resources that cannot be replaced ones they have been exploited. The rate of consumption of their consumption is also seen to be relatively high as compared to the consumption of renewable resources. Examples of non renewable resources include the following: petroleum, coal and uranium. Ways of Reducing Population Growth Population growth refers to the pace at which the size of a particular place increases. There is also a close connection between population growth and fertility. The rate of population growth should be put under control because of the few resources at present. High population growth rates can lead to serious environmental degradation and food scarcity. Reduction of the rate of population growth refers to the artificial methods of controlling population growth. Various countries have experienced serious problems associated with high levels of population growth and their governments came up with mechanisms to manage their high rates of population growth. In china there is a policy of having only one child in a family. Giving birth to more than one child is totally discouraged. People who give birth out of marriage or illegally are always penalized. For example they can be fined. This policy was introduced in china around 1978. It was aimed at solving China’s social-economic problems which were triggered by the high population. This policy has however faced much criticism in and outside China. This is because it has been recklessly implemented and mismanaged. In India the same policy has also been practiced. In this case they encourage the citizens to have two children in a family. Only those people with two children and below are legible to vie for public offices in India. Apart from this measure, they have also been using contraceptives. Iran has been successful in reducing its population gr