the move away from the old geopolitical model of fossil fuel, oil-based power

structure in the world, this transformation is already happening in front of our

eyes faster than anybody could have predicted.

For more than a century our world has revolved around fossil fuels.

The nations that had oil and gas had power.

Wars were fought over the stuff. But as the former president of Iceland,

Olafur Ragna Grimson says, that world is changing. I'm James Landell, the BBC's diplomatic correspondent, and for the BBC World Service

I've been looking at how the transition from fossil fuels to clean renewable energy

could transform global geopolitics.

For that technological revolution is taking place

and turning the world upside down.

We're in the broad plains of Andalucier in southern Spain, hot as you might expect, and

rising up ahead of us is this extraordinary tower.

And at the top of this is this incredible light,

this incredibly bright light that you almost need

sunglasses to look at.

From here it looks incredibly random, just a stranded lighthouse

with no ships to war. This is

is Hemasolar, one of the most revolutionary solar energy plants in the world.

We're getting a bit closer now and the light is so bright,

almost as if a piece of the sun has fallen to earth

and just come to rest at the top of this extraordinary tower.

...