On Thu, 10 Dec 2009 11:17:20 -0600, Bill Ward
wrote:

On Thu, 10 Dec 2009 03:57:22 -0800, Dawlish wrote:

On Dec 10, 10:56Â*am, "I M @ good guy" wrote:
AGW has to be
based on more than the simplistic assumption that CO2 increases causes
temperature increases.

Obviously it is. CO2 increases will cause temperature increases unless
other (natural) factors override the increase which is being caused by
increasing CO2. The physics behind that was settled over a century ago.
Pumping more CO2 in the earth's atmosphere *will* increase absorption of
outgoing IR radiation and it will cause warming. That is accepted by
almost all climate scientists and physicists and whether you like it, or
not, it is. The greenhouse effect is well understood and the physics
behind it really are settled. The degree of warming that will be caused
caused by increasing the atmospheric concentration of CO2 is also
settled, unless you wish to change those physical laws.

That brings me to the point of my original post. Given that the physics
is settled, why isn't the earth cooler than it presently is, given that
two of the major natural varients (PDO and Solar output) are in a state
that ought to mean that they are having a negative effect on
temperatures - which they clearly aren't? They should be causing cooling
and we should not be experiencing some of the warmest conditions in 130
years - unless the natural effects are *not* managing to override the
effects of CO2; which logically leaves CO2 as the main driver of global
temperature increase. Unless I (and also the vast majority of climate
scientists) see something else affecting global temperatures in a
greater way than the physics shows the increases in CO2 should, I'm more
likely to strengthen my views on CO2 being the cause of GW, than not.

You might want to check your physics. Simple assertion that "it's
settled" went out with Al Gore. You need to account for WV, LTE,
convection, negative feedbacks, etc, before you will convince anyone.

Try explaining rather than just claiming.


If anybody wants it colder, they can just come
to Chicago and it will be.

http://www.chicagotribune.com/news/weather/