Some good news about the bad news.

[NNadir]

During the government shutdown, I really worried that the continuously collected data at the Mauna Loa CO₂ Observatory since 1959 would not be collected.

It appears from the data pages, that only one week's worth of data was lost, that of the week beginning September 28, 2025 was not collected.

However they did it, the scientists at the Observatory were able to collect data. How I don't know.

Interestingly, the lost week may have been the annual local minimum, since the data does have some statistical noise. As it stands, the local minimum took place in the week beginning September 14, 2025, when the concentration of the dangerous fossil fuel CO₂ was 423.98 ppm. This is 2.27 ppm higher than the local minimum for 2024, which took place in the week beginning September 22, 2024, when the concentration of the dangerous fossil fuel CO₂ was 421.71 ppm.

The concentrations have been rising (with one week missing) since the week beginning September 14, 2025.

The current readings:

Week beginning on November 09, 2025: 426.80 ppm
Weekly value from 1 year ago: 423.52 ppm
Weekly value from 10 years ago: 400.48 ppm
Last updated: November 16, 2025

Weekly average CO2 at Mauna Loa

The current reading, if one has not joined Greenpeace and thus can do simple calculations, is 3.28 ppm higher than week 45 one year ago.

I'm relieved that the loss of data was not more profound. Kudos to the scientists who maintained the work, despite the very real possibility that they were not being paid for doing so.

I'm working to update my spreadsheet for the data.