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Yes it is. For example, if CO2 concentrations and/or global temperatures went down by much more than the measurement uncertainties, the claim would be falsified.
I said:
The claim doesn't mention any measurement uncertainties. Moreover, the actual claim is "CO2 cascades into a warming event" and, y'know, it's just an event. Maybe it's an event with a tiny magnitude, maybe another event happens which counterbalances the CO2 effect, maybe the event ends, who knows...