Seasonal temperature fluctuations between January and July are many
magnitudes greater than any temperature variation arising from long
term global climate fluctuations irrespective of the dispute as to
the origins of these long term variation.

As planetary dynamics are involved in cyclical seasonal
variations,meteorologists omit the single greatest input or rather opt
for a less likely input based on planetary inclination to solar
radiation.

In short,meteorologists do not know what causes the seasons via
planetary dynamics,at least presently insofar as they rely on the
flawed original premise and conclusion of Copernicus -

"To this circle, which goes through the middle of the signs, and to
its plane, the equator and the earth's axis must be understood to have
a variable inclination. For if they stayed at a constant angle, and
were affected exclusively by the motion of the centre, no inequality
of days and nights would be observed. On the contrary,it day or the
day of equal daylight and darkness, or summer or winter, or whatever
the character of the season, it would remain identical and
unchanged." Copernicus

http://www.liverpoolmuseums.org.uk/n...gh_low_sun.gif

Without an understanding of planetary dynamics as the cause for
seasonal temperature fluctuations,linking carbon dioxide levels as
solely respsonsible for global climate variations is reckless in the
extreme.