As before the AGW argument is irrelevant as there is not enough fossil
fuels economically available to cause the suggested problem of temperature.
It is a matter of Energy Return on Energy Invested.
ERoEIs of all fossil fuels are falling.

We do have to leave oil, gas and coal before they leave us.
Of that there is no doubt.

So the problem is to manage the transition to a new energy regime.
We have to do it before the ERoEI of our present fuels falls below
approx 5:1. Some say 7:1 is the critical figure.
If we fail to act in time our complex society will go the way of the
Roman Empire.
It failed because its return on effort expended fell below sustainable
levels.
The quantity of silver from the Spanish mines fell below a sustainable ERoEI.
The cost of slaves, a major source of energy, fell to a low ERoEI.
It lost its seaborne trade to Arab pirates and the wheat from Egypt.
A source of energy.
Just like the Cheetah must get more energy from its kill than it
expends in chasing it, so must an economy get a gain in energy.
The falling ERoEI of European energy is reflected in their low GDP.

All I am saying here is we need alternative energies but we cannot
waste time mucking about with half baked schemes.

An enormous amount of energy will be required to build the new energy
system and we will need oil & coal to do it. If we do not use them
there may be no other way to get to where we need be.

If not say "Hello Augustus"