Climate alarmism has little to do with the radiative properties of CO2. Rather, the Intergovernmental Panel on Climate Change’s (IPCC) scary projections derive from conjectured ‘positive feedbacks,’ mostly from water vapour, that are presumed to dangerously amplify the otherwise welcome effects of radiative warming by atmospheric CO2. But again there is no proven correlation between higher atmospheric CO2 concentrations and these hypothetical feedbacks, including moist vaporous ones.