This is an interesting dance around the issue:
Sceptic
Ice-cores dating back nearly one million years show a pattern of temperature and CO2 rise at roughly 100,000-year intervals. But the CO2 rise has always come after the temperature rise, not before, presumably as warmer temperatures have liberated the gas from oceans.

Counter (the dance which doesn't address the issue)
This is largely true, but largely irrelevant. Ancient ice-cores do show CO2 rising after temperature by a few hundred years - a timescale associated with the ocean response to atmospheric changes mainly driven by wobbles in the Earth's orbit. However, the situation today is dramatically different. The extra CO2 in the atmosphere (35% increase over pre-industrial levels) is from human emissions. Levels are higher than have been seen in 650,000 years of ice-core records, and are possibly higher than any time since three million years ago.

All true statements, but not addressing the issue.. There has yet to be anything established showing an increase in CO2 will be the cause of global warming.. in the past, after things have warmed, co2 levels rose.. so co2 didn't have anything to do with prior warming cycles.

I just don't get how something that makes up such a small percentage (0.3%?) can have such a huge effect.. funny how I can't find the percentage - either it's late and I'm just not searching right or references to that are disappearing!

Anyway - check out the link below..

• CO2 vs temperature: ice core correlation & lag