greggerypeccary wrote on Jan 5
th, 2014 at 2:13am:
30 years out of 4.5 billion years is not "long term", by any stretch of the imagination. Agreed?
Greg, there is no absolute value for long term and short term. They are figures of speech. In this context, we are talking about climate and weather. These are well defined fields of study.
Generally when we speak about climate, we are not talking about paleoclimate. Paleoclimates are very interesting, but the conditions in the distant past bear no resemblance to the world we know today.
Climate change is to a large extent concerned with the effects on the world as we know it today. We need to have forward planning to determine what actions we need to take over the next few generations and what challenges we are going to face.
Paleoclimate is very experimental, and generally based on what we know about climate mechanisms today. The further we go into the past, the less accurate and less reliable these figures become.
If you really want to go back to Cambrian times when the land surface could support no life, the only life lived in the bottom of the oceans and the sun was somewhat dimmer that it is today (we think), the ocean circulation patterns were totally different, the distribution of land mass was completely different etc, then go for it, but that's your private context. It serves no purpose other than to introduce a red herring.
Of course, red herrings are what you do best.