The three basic requirements for life are Energy and Water so that the necessary biochemistry can take place to create Biomass.
There is only one Energy source and that is the Sun.
The Sun initiates the Water Cycle by causing evaporation of sea water to form clouds, creating temperature and pressure differentials that cause winds that blow the clouds over land where they deposit clean freshwater as precipitation.
The Sun initiates the Nutrient Cycle by providing the Energy for Primary Biomass formation via photosynthesis, a process that started in water when Cyanobacteria and algae became the first life-forms of earth and still requires water when it drives plant and crop Biomass formation on land.
Fossil fuels are fossilized Primary Biomass, so it is more accurate to view them as Secondary Energy from the Sun. Biomass provides a means of storing the Sun’s Energy which we later access by combustion.
So switching to “renewable” Energy is really switching to Primary Energy from the Sun (photovoltaic, wind, hydro etc) from Secondary Energy from the Sun – Biomass in the form of wood, coal or oil.
- we sit at the top of the Food Chain
- our population has exploded during the Anthropocene age and
- we live in high density urban developments