We have not inherited this world from our forefathers but borrowed it from our children. If we want them to get all the resources , we should work towards sustainable development. Sustainable development means that developmemt should take plave without degrading the environment and the development in the present should not comprimise with the need of future generation. But the sad part is today's development is not sustainable. The ground water level is depleting at a faster rate due to excessive irrigation, etc. Though water is renewed by the hydrologic cycle but we are using the resource before it gets renewed. Simlarly, we have fixed reserves for fossil fuels. Once exhausted they will take millions of years to form again. Besides depleting reserves they also cause global warming .