"Terry Fields" wrote in message
...
harry wrote:

http://en.wikipedia.org/wiki/Primary_energy

Look and see what primary energy is. Just look at the pie chart.

Under the 'Renewables' list 'Geothermal energy' is mentioned, and
links to another Wikipedia page.

Unfortunately, that page says right up front that

"Geothermal energy is thermal energy generated and stored in the
Earth. Thermal energy is the energy that determines the temperature
of matter. The geothermal energy of the Earth's crust originates from
the original formation of the planet (20%) and from radioactive decay
of minerals (80%)"

Since in the Primary Energy page 'natural uranium' is classed as
'non-renewable' and 'formation of the planet' won't happen again
(making it non-renewable also), do you get the impresson that there's
some wishful thinking going on here?

Well as the time scale is millions of years and it is non-polluting/no waste
it is comparable to tidal energy which you could argue slows the earth down.