We all need a source of power - to stay warm, to cool things down, for moving around, to cook, to make things. The question is, with a global human population of 7.6 billion people, just where do we get this energy from in a way which sustains our planet? Until just 100 years ago, the answer was always simple and local: wood for burning (regenerates in 100 years); animal power with horses, oxen and buffalo; and, harnessing the wind and water power of windmills and water-races.

Then we started to be exploitative in a hunt for 'quicker' energy that could be scaled-up and low cost. We started to dig and drill for carbon fuels. These have taken millions of years to form and are therefore scarce and non-renewable in any meaningful sense of the human timescale. They also produce carbon as a bi-product which we are beginning to realise has many adverse consequences. Carbon fuels have become a 'currency' - a valuable commodity that is traded, fought over, accumulated, guarded, and stolen (by the wealthy for their own use at the expense of the poor).

Why on Earth (literally) do we need to do this? We are surrounded by limitless sources of natural energy that we can adapt and transform into usable energy at almost any time.

Our planet receives solar energy constantly. It's so strong that it burns human skin, shrivels crops, evaporates water, and creates deserts. It's limitless!

Our spinning planet generates variable atmospheric pressure which in turn generates massive air movements that move across continents and oceans. We know how to harness this naturally recurring power!

The core of our planet is an enormous heat source - calculated to be around 6,000 degrees centigrade at the boundary between in the outer and inner cores. We gain some idea of this heat reservoir from volcanic eruptions and hot springs. Even at a depth of just one metre there is sufficient heat to be harnessed every day for most human needs. Why don't we do this?

The gravitational effect of the moon creates tidal movements twice each day in the oceans that make up 71% of the surface area of the planet. Simple ebb-and-flow sluices are capable of capturing this enormous energy.

And the natural water cycle of evaporation - cloud - rain - streams and rivers produces a continuously recurring pattern for utilising water as an energy source. As a rule-of-thumb, the areas of the planet most suited to water energy are conveniently those least endowed with solar energy!

There is no need to exploit and burn fossil fuels. Nature produces limitless energy all-day every-day. It requires a change in our attitude to energy harnessing and power consumption. We could make this transition in less than one generation. And in the process, we'd make our planet so much 'greener'.

And that's before we even begin to consider the potential of "human energies" - the energy of our physical bodies and our spiritual prayers.