notice he's not an atmospheric physicist. you're also right in part - we need to know NOTHING of past climate conditions to say that an increase in atmospheric CO2 will cause the earth to warm, on average. But how much CO2 is needed to cause the earth to warm by x amount is certainly still open for debate in the scientific community.
More to the point though, this article clearly articulates that ice core measurements of CO2 concentrations from previous years are likely to be an UNDERESTIMATE of the actual atmospheric concentrations at those times. What's the point? Well, given what we know about the carbon cycle, that suggests that we've seen much higher atmospheric levels of CO2 before humans ever began to industrialize. And, if we remember how small of a % of CO2 emission is from human activity, it is highly likely that the Hawaii data, etc., does not show a deviation from the normal carbon cycle.
so, lets say that atmospheric CO2 is increasing and that the earth is warming (for the sake of argument). Without the ice core data to establish a baseline atmospheric CO2, there is NO case that humans are raising the levels of atmospheric CO2 to cause the warming, rather than CO2 just increasing in the atmosphere as a result of a natural cycle.
I hate speaking to rocks...




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