The present sources of energy used by people in India include crude oil, which India imports from abroad because it does not have enough stocks of its own. When oil prices increase, this becomes a burden for everyone. Groundwater is another resource used in India, which is an example of renewable resources replenished by nature.

However, there are serious concerns about sustainability. Non-renewable resources like crude oil will get exhausted after a few years of use. According to the data, world crude oil reserves would last only about 50 years at the present rate of extraction. This means the current energy sources are not sustainable in the long run.

Fifty years from now, the possibilities for energy sources could shift dramatically. As non-renewable resources get exhausted, there will be greater need to rely on renewable resources that can be replenished by nature. We may also discover new resources that were previously unknown, which could add to the stock.

The question of sustainability of development raises fundamentally new issues. Scientists have been warning that the present type and levels of development are not sustainable. We need to ensure that development is maintained for future generations.

In conclusion, India must plan for a future where non-renewable energy sources are exhausted. The shift towards renewable energy and sustainable development practices would be essential to ensure that we do not compromise the resources that belong to future generations.