"dennis@home" wrote in message
b.com...
On 23/07/2013 09:40, Tim Streater wrote:
In article om,
"dennis@home" wrote:

On 22/07/2013 23:34, mcp wrote:
On 22 Jul 2013 07:44:10 GMT, Terry Fields
wrote:

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?

The radioactive decay of minerals will happen at the same rate whither
or not we use geothermal energy. If you burn uranium in a reactor you
will use it up making it non-renewable.

Its already non renewable.
there is no mechanism to renew it.

Set yourself up a supernova. But you don't want to be within 20 or so
lightyears from it when it goes off.


I doubt if we would survive one that close, maybe a hundred times as far?

http://en.wikipedia.org/wiki/Near-Earth_supernova