Because Non-renewable energy is energy that could
become depleted, we have to be thrifty with it. If
we persist with our present behaviour, oil will be depleted within 32
years, gas will be depleted in 72 years and we will have coal till
the year 2259.
Another minus of non-renewable energy
is that it is more pollutant than renewable energy. Polar ice is
melting, ocean- and seawater levels are rising, and air pollution is every days reality. Because of these facts we are developing techniques to
mass-produce renewable energy.