For over a hundred years we have been living on borrowed energy. We are borrowing the solar energy collected over millions of years by ancient plants and algae. However, that energy source will eventually run out. Estimates of when vary from industry to industry and from expert to expert. They all agree that the supply is finite, but when that finite supply will run out is unpredictable. We have to find another way to provide for our growing civilization. The path forward runs through green and sustainable energy.
In order to maintain sustainable energy, methods of energy efficiency must combine with the ability to renew the energy. Some contamination of the environment is often part of generation of sustainable energy that can be continually generated over years of use. Still, the amount of carbon dioxide emitted into the atmosphere must be minimal. Environmentalists study to improve methods of energy generation and consumption for efficiency and continual generation.
When management of sustainable energy is maintained, the process begins to bring success and a cleaner, more efficient and successful world is the result. The rewards for the efforts made in the endeavors toward such continual stewardship of energy are phenomenally significant.