Energy Crisis

The statement "if energy cannot be created or destroyed, how is there an energy crisis?" seems logical. However this is true in the context of Physics. When the energy crisis is being discussed, energy's resources are being considered not energy itself. Also, although it is true that energy cannot be destroyed, it is true that energy can be changed into a somewhat useless form. When energy converts and results in movement that is good. When energy converts with friction and results in sound and heat energy that is somewhat useless considering the "energy crisis". There seem to be a lot of possibilities for reusing energy but energy bi-products are currently not being collected efficiently. For a somewhat far out example consider perspiration. We eat for energy. If we use the energy running (kinetic energy) our body temperature increases (thermal energy) and we perspire to cool ourselves off. Some moisture evaporates, some is absorbed into our clothes, and some drips off the body. We could potentially collect our perspiration and use it to provide energy for something else couldn't we? Sure. We would have to use a lot of thought and modification, but it could be done. This may be a stretch but the point is that humans are not efficient at harnessing waste energy.