What is meant by ‘Energy crisis’?
A.Shortage of hydro-electricity
B.Malnutrition leading to short supply of energy in human body
C.Shortage of thermal power
D.Impending danger of total exhaustion of fossil fuels like coal and petroleum

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Hint: Over the last two centuries, energy needs have skyrocketed dramatically, especially because of the transportation and industry sectors. However, fossil fuel is polluting and their reserves are limited. Two separate issues which are closely related, are the energy crisis and climate change. As ever, the need for energy is growing day by day due to the growth in the population and the use of electronic gadgets. At the same time, there is an apparent escalation in the depletion of fossil fuels and other power generation tools. Therefore, serious attempts are being made by both developed and developing countries to find different ways to resolve energy shortfalls across the globe.

Complete answer:
Fossil fuel is a form of buried geological fuel deposits containing organic materials that are created from decayed plants and animals that have been converted over hundreds of millions of years into liquid forms crude oil, coal or gaseous state like natural gas by exposure to heat and pressure in the earth's crust.
An energy crisis is a major cut back in the energy supply within an economy. It is often referred to the excessive usage of a particular energy source that is difficult to renew over a certain period of time at a large scale. The energy crisis begins when the use of fossil fuels exceeds to an extent that it becomes impossible to produce newer versions of it and the use creates an enormous amount of pollution. On top of that, burning of these fuels result in the emission of greenhouse gases and it is the major cause of global warming.
Causes of energy crisis include;
1. Overconsumption of fossil fuels which will lead to complete disappearance of fossil fuels.
2.Over population which leads to overconsumption of these fuels.
3.Old infrastructures which require additional powers and errors due to wear and tear which will lead to high energy consumption.
4.Energy wastage done by almost all the individuals which will decrease the amount of energy that may be required for future use.
Solution to a much more sustainable future in the energy department and environment protection requires wise and scheduled usage of power alongside adding renewable energy sources like solar power and wind energy into our day-to-day life.

Hence, the correct answer is option (D).

Note: Governments around the world are already working to increase emissions of greenhouse gases from fossil fuels to avoid the worst consequences of climate change. As part of the 2015 Paris Agreement, countries have agreed to emissions reduction goals at the international level, while other organisations have made their own commitments, including cities, states, and companies. These initiatives usually concentrate on replacing renewable energy sources with fossil fuels by rising energy efficiency.