Inconvenient truth: the more CO2 already in the atmosphere, the less difference each additional ton makes.
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But if* the central issue is whether we pass a certain threshold of CO2 in the atmosphere, additional tons matter. * I don’t know that much about climate change issues, but I hear that certain thresholds are important to the issue.
The thresholds are imaginary. (Or, more precisely, they're political creations driving pseudo-science. E.g., nothing in particular happens at +2 deg C.)
