Australia has only had reliable weather records for 100 years at...

Australia has only had reliable weather records for 100 years at best, in many places a lot less.
Even satellite data conflicts depending on how the data is analysed.
CO2 concentrations in the atmosphere are miniscule.

Surely the orbit of the earth around the sun, it's inclination, the output from the sun etc. have much, much more effect that anything we do.

A decent volcanic eruption can emit more SO2 and CO2 than what we do in a entire decade.

I have just read that 2007 is going to be recorded as quite a cool year for the Pacific region because of the cooling effect of the La Nina ocean current.

Another scare tactic by big business to force us to pay for carbon taxes, new expensive technology and make us feel insecure and needing "rescue" by government.