Question

why there is energy crisis if universe has constant energy

Answer 1

This is because not all the energy  in the universe is in a form which can be used by humans. We cannot do anything useful from random molecular motion or radiation directly. We can convert some of the thermal energy into work but there are theoretical limits to how efficiently we can do that and it is much less than 100%. When people talk of energy crisis, they mean they are running out of resources which have sufficient energy stored in their chemical bonds that can be harvested first to produce 'heat', which can then be further utilized to do some useful work like running a turbine  to produce electricity. Much of the energy of the universe is condensed in the form of mass itself, but there are only a few rare minerals from which we can destroy some of its mass to produce equivalent energy in a profitable way (nuclear fission). So yes, energy crisis is a real concern for mankind and not a conspiracy of scientists to dupe the  public.

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