"Steve Jackson" wrote in message
...
On Tuesday, May 14, 2013 7:57:45 PM UTC+1, Alastair wrote:

It is now certain that the Greenland and west Antarctic ice sheets will
disappear, raising sea levels by over 10m. It is not a matter of whether
but when. Moreover, the Arctic sea ice will disappear first, but the
consequences of that are unknown, except that the melting of the
Greenland ice sheet will surely accelerate.

A bit of an over-reaction Alastair, almost Al Goresque!

Only detailing the facts :-(

Al Gore chose the 100 k yr cycles as the most dramatic illustration of the
correlation between CO2 and temperature, but there is also a less obvious
correlation going back 600 M yrs. See:
http://www.geologywales.co.uk/storms...zoic_royer.jpg

Now we have raised CO2 to 400 ppm we have sent the climate back 2 M yrs to
before the northern ice existed and Mankind strode the planet.

But there is a greater danger. Here you can see another chart of temperature
against CO2 over the last 600 M yrs
http://deforestation.geologist-1011....mperatures.png
where the temperature makes step changes. That is my concern. Will CO2 pass
a tipping point where after a period of stability the global temperature
then jumps into a new extreme state.

Cheers, Alastair.