Time's up, CO2

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Science  02 Aug 2019:
Vol. 365, Issue 6452, pp. 411
DOI: 10.1126/science.aay8827

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  • RE: Time's up, CO2

    The editorial discussing the current climate alarmism is incomplete. It omits the actual science of climate change which, we are incessantly advised, is a chaotic dynamic non-linear system, and thus opaque to prediction, prognosis, and therapeutics.

    One thing is sure: CO2 at this time, at these levels, is not in control of climate change. Of the 8 known climate drivers, CO2 at these levels is one the least powerful. Its GHG effect declines exponentially, as noted by Arrhenius, producing 50% of its effect in the first 20 ppm. We are in the fifth half-life of that decline, so the next doubling to 800 ppm will increase its effect by less than 2%.

    It is not a pollutant. It is colorless, odorless, tasteless, makes plants grow larger and lusher, and helps them resist drought. US Navy submarines do not take CO2 mitigation measures until it reaches 8000 ppm. CO2 is also virtually the only GHG in the stratosphere to radiate IR out to space, so it cools us too.

    In the last 550 million years, not one temperature reversal has been preceded by a CO2 change. In the last 14,500 years, since our emergence from the Last Glacial Maximum (CO2 220 ppm) none of the temperature changes have been preceded by CO2 change, including our emerging from the Little Ice Age around 1840. Human CO2 production didn't take off until 1880, after which temperature declined till 1915, then rose until 1942, then declined slightly but enough to provoke alarms about the Oncomin...

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    Competing Interests: None declared.

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