Quote:
Originally Posted by Archy
Which conclusion: I made statements
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"it takes a very large increase in CO2 to induce a small increase in temperature"
(a) The increase in CO2 as a result of the Industrial Revolution from 1800 onwards is also accompanied by an increase in particulate emissions.
Particulate emissions provide a negative feedback and therefore offsets the greenhouse effect of CO2. ("global dimming").
(b) The interglacial/warm periods (excluding the current phase) have been initiated by an increase in temperature either through an increase in solar radiation, changes in the angle of the Earth's rotational axis, or axial precession of the Earth's orbit. This in turn has increased CO2 levels.
Steven