"lawrence Jenkins" wrote in message
...
Soryy to post this way I'm on another PC using the BT ISP and they are
useless I only get fragments of the NG on there. So I'm using google to read
and BT to post. I could post from google but I just can't be arsed with
another user no and password. Anyhow

Col made the point that Co2 rises had gone hand in hand with World
temperature increases That's not strictly true. The record shows that temps
actually fell between 1940 ish through to the mid 70's
http://www.cru.uea.ac.uk/cru/info/warming/

I was aware of this (small) dip, indeed I even recal the scares in the mid
70's that said we were heading for another ice age
However whatever way you look at it, the trend is upwards.
What is interesting about that graph is that the trend from 1905 to 1940
is very similar to 1975 to now.
Did metereologists in 1940 wonder what was going on or did they
simply put it down to natural variability?
My reckoning is that this was the first 'spurt' of global warming but
nobody recognised it as such at the time.


Whereas Co2 actually started to rise rapidly plus the fact it had been
increasing steadily since the beginning of the 20th century So explain the
dip based on the simple equation more Co2 = increased linear warming

The 1940-75 period was not so much of a dip, more of a levelling of
temperature. It was a pause for breath in the general increase in temps
that at been observed since the beginning of the century.
As for it's cause, well probably the natural variability of the climate held
temperatures down during this period.

And it's interesting to see that even today the rate of rise appears to
be slackening off, just as it did around 1940.
Perhaps we will enter a several decade long period of roughly stable
temperatures, just as we did then?

Col
--
Bolton, Lancashire.
160m asl.
http://www.reddwarfer.btinternet.co.uk
http://www.reddwarfer.btinternet.co....rPictures.html