[elfman2]

I don’t follow this too closely, but it looks like you two do. Can I ask, are you familiar with any good studies that question if long term CO2 increases are even possible? I heard of an experiment 5 years ago that showed substantially greater plant growth with minimally raised CO2 levels.

So wouldn’t oxygen be created that brings CO2 levels back down again? Do you think that this balance is adequately addressed in global warming/climate change models?

[shubi]

Plants use CO2 in photosynthesis to produce O2 and water.

As CO2 levels rise, more foliage would grow and produce more oxygen. But the oxygen doesn't cause the CO2 to disappear. And when living things die, O2 is used in the rotting process. It is a complicated cycle, but generally there is a natural balance in nature that prevents CO2 build up.

There have been times when CO2 concentrations have been higher. Volcanoes put out more CO2 in an eruption than man does in years.

It is one thing to measure the CO2 going up and another whole problem to peg it to man's activity.

[Drammach]

So wouldn’t oxygen be created that brings CO2 levels back down again?

I recall reading an article concerning this point..
Locale was East coast, ( Wash, Atlanta, Richmond ? ) and the complaint was "that oxygen".
It was Ozone...
Ozone created at ground level is a pollutant..
It readily combines with.. everything.. especially exhaust fumes from industry, vehicles, etc..

The people in the area wanted to cut down the forest..
You just can't win..

[mista science]

I don’t follow this too closely, but it looks like you two do.

I haven't followed the issues closely for a few years, since it seemed that politics was likely to continue to trump science.

Can I ask, are you familiar with any good studies that question if long term CO2 increases are even possible?

So wouldn’t oxygen be created that brings CO2 levels back down again? Do you think that this balance is adequately addressed in global warming/climate change models?

I can't answer either question. But you might check out www.co2science.org for those specific questions, and www.junkscience.com and www.john-daly.com for more general information. John Daly died last year, and his site, though still maintained, is not as active as before. Not sure if all his work is still available there.