[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.

[elfman2]

Anyone able to translate into common language what this pre-processing step was or what their explanation of it is?

" McIntyre & McKitrick found that the Mann et al. methodology included a data pre-processing step, one which was not reported in the original study, that essentially guaranteed that a hockey stick curve would result from their analysis. They demonstrated this by applying the same methodology to many synthetic temperature records that were constructed with random noise. In almost every case, a hockey stick curve resulted. "

[elfman2]

" As CO2 levels rise, more foliage would grow and produce more oxygen. But the oxygen doesn't cause the CO2 to disappear. "

Not the oxygen, the “plants”. Plants cause oxygen to “disappear”.

Are you sure that plant decay depletes exactly 100% of the oxygen that they produce in their life? Otherwise, wouldn’t the plant build up excess CO2 from volcanoes and animals?

Also, wouldn’t that vary greatly between and the plant’s, species, life and environment?