Archives par mot-clé : Net Zero

climate-debate

‘No Measurable Effect’: Study Finds ‘Net Zero’ Emissions Would Have Negligible Climate Impact

by K. Richard, Dec 16, 2024 in ClimateChangeDispatch

net zero
Cost-benefit analyses affirm it would be better to abandon Net Zero policy initiatives and instead “do nothing” about greenhouse gas emissions. [emphasis, links added]

New research finds that CO2’s largest possible climate impact is “negligible.”

The cumulative expected temperature change in doubling CO2 from 400 to 800 PPM is only 0.81°C at most, and this is “certainly not cause for alarm or for declaring a climate emergency”.

As Figure 1 from the paper shows [pictured below], the temperature effects of increasing CO2 are strongest when concentrations hover below 100 PPM.

After that, the CO2 impact collapses logarithmically to less than 0.05°C even as concentrations rise to 900 PPM.

Using heat-transfer calculations, it is estimated that even if governments across the world were to actually achieve all of their proposed Net Zero policy goals, it would only elicit a 0.28°C reduction in global temperature.

In other words, it would have “no measurable effect” on climate.

The tens of trillions in costs to achieve an inconsequential global temperature reduction would be much better spent on policies that would improve the economic, health, and educational conditions of those living in poverty.

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climate-debate

Net Zero CO2 Emissions: A Damaging and Totally Unnecessary Goal

by R. Spencer, Apr 18, 2024 in GlobalWarming

The goal of reaching “Net Zero” global anthropogenic emissions of carbon dioxide sounds overwhelmingly difficult. While humanity continues producing CO2 at increasing rates (with a temporary pause during COVID), how can we ever reach the point where these emissions start to fall, let alone reach zero by 2050 or 2060?

What isn’t being discussed (as far as I can tell) is the fact that atmospheric CO2 levels (which we will assume for the sake of discussion causes global warming) will start to fall even while humanity is producing lots of CO2.

Let me repeat that, in case you missed the point:

Atmospheric CO2 levels will start to fall even with modest reductions in anthropogenic CO2 emissions.

Why is that? The reason is due to something called the CO2 “sink rate”. It has been observed that the more CO2 there is in the atmosphere, the more quickly nature removes the excess. The NASA studies showing “global greening” in satellite imagery since the 1980s is evidence of that.

Last year I published a paper showing that the record of atmospheric CO2 at Mauna Loa, HI suggests that each year nature removes an average of 2% of the atmospheric excess above 295 ppm (parts per million). The purpose of the paper was to not only show how well a simple CO2 budget model fits the Mauna Loa CO2 measurements, but also to demonstrate that the common assumption that nature is becoming less able to remove “excess” CO2 from the atmosphere appears to be an artifact of El Nino and La Nina activity since monitoring began in 1959. As a result, that 2% sink rate has remained remarkably constant over the last 60+ years. (By the way, the previously popular CO2 “airborne fraction” has huge problems as a meaningful statistic, and I wish it had never been invented. If you doubt this, just assume CO2 emissions are cut in half and see what the computed airborne fraction does. It’s meaningless.)

Here’s my latest model fit to the Mauna Loa record through 2023, where I have added a stratospheric aerosol term to account for the fact that major volcanic eruptions actually *reduce* atmospheric CO2 due to increased photosynthesis from diffuse sunlight penetrating deeper into vegetation canopies:

What Would a “Modest” 1% per Year Reduction in Global CO2 Emissions Do?

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