March 23 2025 - On The Very Edge Of 430 Parts Per Million

[hatrack]

Last edited Tue Mar 25, 2025, 03:13 PM - Edit history (1)

So as of yesterday, we were at 429.64 ppm per NOAA/GML. We could hit 430 tomorrow (that is, today, with confirmation of the March 24th numbers), or it could be next week, since daily readings bounce around a fair amount.

What is certain is that we'll breach 430 soon, though only temporarily through early June. That too will change. What is also certain is that by late March 2027, 430 will be permanently and irrevocably in the rearview.

https://co2.earth/daily-co2

[Botany]

1. This why Musk/Trump are working to shut down the NOAA climate observatory on Mt. Mauna Loa

Can’t have all that data about CO 2 levels getting out there. Trump promised the fossil fuel
industries if they supported him in 2024 he would shut down all that “climate stuff.”

https://upload.wikimedia.org/wikipedia/commons/c/c5/Mauna_Loa_CO2_monthly_mean_concentration.svg

“Mauna Loa Observatory (MLO) is located on the north flank of Mauna Loa Volcano, on the Big Island of Hawaii, at an elevation of 3397 meters, or 11,135 feet above sea level. The observatory is a premier atmospheric research facility that has been continuously monitoring and collecting data related to atmospheric change since the 1950's.“

[SheltieLover]

3. Absolutely!

Besides, pootin is jealous...

[NNadir]

2. We had a daily reading over 430 on March 7 and again on March 10.

The 7th was 430.60 ppm; the 10th 430.19.

I'm fairly certain we'll see weekly averages above this by May, if not sooner.

[hatrack]

5. Oh, interesting - didn't know it had arrived as early as that . . .

Thanks for the heads-up.

[NNadir]

7. I check it most every day. I'll miss it when King Eloon shuts it.

[Wednesdays]

4. Took me a while to figure out what the OP was about

430 per million what? Chlorine? Sandwiches? Mudkips?

Also, what would a "good" number have been? What are the historical stats on that? I know we could look it up, but that would have saved us all the trouble.

[hatrack]

6. When daily tracking began in 1958, it was 315 ppm . . .

For most of the early Industrial Age, it was around 275. If you're looking for "good" it isn't here. Current levels are approaching early Miocene levels.

Abstract

Based on inferences from proxy records the Miocene (23.03–5.33 Ma) was a time of amplified polar warmth compared to today. However, it remains a challenge to simulate a warm Miocene climate and pronounced polar warmth at reconstructed Miocene CO2 concentrations. Using a state-of-the-art Earth-System-Model, we implement a high-resolution paleobathymetry and simulate Miocene climate at different atmospheric CO2 concentrations. We estimate global mean surface warming of +3.1°C relative to the preindustrial at a CO2 level of 450 ppm. An increase of atmospheric CO2 from 280 to 450 ppm provides an individual warming of ∼1.4°C, which is as strong as all other Miocene forcing contributions combined. Substantial changes in surface albedo are vital to explain Miocene surface warming. Simulated surface temperatures fit well with proxy reconstructions at low- to mid-latitudes. The high latitude cooling bias becomes less pronounced for higher atmospheric CO2 concentrations. At such CO2 levels simulated Miocene climate shows a reduced polar amplification, linked to a breakdown of seasonality in the Arctic Ocean. A pronounced warming in boreal fall is detected for a CO2 increase from 280 to 450 ppm, in comparison to weaker warming for CO2 changes from 450 to 720 ppm. Moreover, a pronounced warming in winter is detected for a CO2 increase from 450 to 720 ppm, in contrast to a moderate summer temperature increase, which is accompanied by a strong sea-ice concentration decline that promotes cloud formation in summer via enhanced moisture availability. As a consequence planetary albedo increases and dampens the temperature response to CO2 forcing at a warmer Miocene background climate.


https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022PA004438

[IbogaProject]

10. It has not been this high for 800,000 years at least

And it wasn't consistantly this high for millions of years. Normal for the end of an InterGlacial period would be low 300s. Last time the proportion of CO2 was above 400 for an extended period the average global temperature was nearly 20 degrees warmer. Our bodies can't handle a much higher heat and humidity combo than we already are hitting in the summer.

High wet-bulb temperatures, where sweat cannot evaporate effectively, pose a serious health risk, especially in extreme heat and humidity, as they can lead to heatstroke and death. The body's natural cooling mechanism fails, and internal temperatures rise dangerously.

https://climatecheck.com/blog/understanding-wet-bulb-temperature-the-risks-of-high-wet-bulb-temperatures-explained#:~:text=The%20human%20body%20relies%20on,children%2C%20according%20to%20the%20EPA.

[IbogaProject]

11. Here is a site by a Rutgers professor and another Academic from Australia

He has been sounding the alarm bells for awhile now. https://arctic-news.blogspot.com/