No..altough living like our ancestors would help preserve energy but it would make our life difficult. The way of living of our ancestors is much primitive and living like them would prevent us from doing a lot in the world like.. The progress of science would be hindered...The ecological balance would be disturbed and so on.
Instead we should try to conserve energy by using renewable sources and minimising the use of fossil fuels which will provide better inhabitance for humans.
We should try to live in a sustainable manner.we should save resources for our future generations too.And also develop new ideas to make eco friendly developments,that is ,development with harming the environment much.developing of new creative ideas to reduce pollution&and new renewable sources of energy, keeping the eco system in a well balanced manner is the best solution rather than trying to live ancestors life.we should use modern technologies,in various fields, helps to make our life easy,but one thing is,make sure it is not damaging our nature&eco system.