how the use of energy resources has changed in the last 30 years
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Conventional energy resources are very limited. So, we must use them with highest savings and great care. Unfortunately, this is not the case; whenever you direct your sight, you see that people are wasting these precious resources and misusing them.
On the other side, scientists and engineers could not until now produce efficient conversion methods for these resources. Think about the conversion efficiency of thermodynamic machines.
The present civilization, which is based on machines driven by energy, may be in danger if we do not make up our minds for the issue of energy.
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