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[h=3]Anthropogenic CO2?[/h] The human-caused origin (anthropogenic) of the measured increase in atmospheric concentrations of CO2 is a cornerstone of predictions of future temperature rises. As such, it has come under frequent attack by people who challenge the science of global warming. One thing noteworthy about those attacks is that the full range of evidence supporting the anthropogenic nature of the CO2 increase seems to slip from sight. So what is the full range of supporting evidence? There are ten main lines of evidence to be considered:
- The start of the growth in CO2 concentration coincides with the start of the industrial revolution, hence anthropogenic;
- Increase in CO2 concentration over the long term almost exactly correlates with cumulative anthropogenic emissions, hence anthropogenic;
- Annual CO2 concentration growth is less than Annual CO2 emissions, hence anthropogenic;
- Declining C14 ratio indicates the source is very old, hence fossil fuel or volcanic (ie, not oceanic outgassing or a recent biological source);
- Declining C13 ratio indicates a biological source, hence not volcanic;
- Declining O2 concentration indicate combustion, hence not volcanic;
- Partial pressure of CO2 in the ocean is increasing, hence not oceanic outgassing;
- Measured CO2 emissions from all (surface and beneath the sea) volcanoes are one-hundredth of anthropogenic CO2 emissions; hence not volcanic;
- Known changes in biomass too small by a factor of 10, hence not deforestation; and
- Known changes of CO2 concentration with temperature are too small by a factor of 10, hence not ocean outgassing. Climate Change Cluedo: Anthropogenic CO2