Energy · The hall
429 parts per million
NOAA: the air at Mauna Loa averaged 429.12 ppm of CO₂ in July 2026. In 1959, when the Keeling curve began in earnest, it was 316. Pre-industrial air was about 280. This is the most important number on the desk.
- Mauna Loa CO₂, July 2026 (ppm)
- 429.12
- Annual mean, 1959
- 316
- Pre-industrial
- ~280
- ppm vs July 2025
- +1.25
The quietest exponential on earth
Keeling started measuring on a Hawaiian volcano so that local smoke would not lie. NOAA’s July 2026 monthly mean is 429.12 parts per million. July 2025 was 427.87. The annual mean crossed 400 in 2015, 410 in 2019, 420 in 2023. The covid year did not show up. The energy transition, on this chart, has not shown up either. Renewables overtaking coal is a generation mix. This is the stock of the atmosphere.
A number that does not care about your 2025 vintage
Pair this with 1.5 tenths and The uninsurable year. Temperature is the damage. Insurance is the invoice. 429 ppm is the cause, still compounding at more than two parts per million some years. Index this series to 1959 and the fold is not a tech learning curve. It is a one-way valve. The investing tell is not a carbon credit. It is anything whose cash flow is written against a 280 ppm climate: coastal housing, a 20th-century crop map, a reinsurance treaty that assumed a 20th-century loss curve.
The long view is the stock, not the flow
Even a sudden halt in emissions leaves 429 in the air for decades. Own adaptation that reprices (reinsurance, cooling, water, grid flexibility) and the electrons that actually displace a tonne. Do not own a 2030 ‘net zero’ slide that needs the Keeling curve to flatten next year. It has not.
Investing lens
Horizon 10–30 years · Educational, not advice
429 ppm is the constraint under every physical asset. Own adaptation and real abatement. Do not underwrite a 280 ppm world.
Where the map points
- Reinsurance that can reprice, and adaptation that changes a loss curve
- Firm clean power and the grid kit that makes it usable
- Cooling, water, and heat-resilient logistics
- Avoid a carbon-offset coupon as the thesis
What can break it
- A lucky volcanic year that looks like a new mean
- Policy that prices carbon in one jurisdiction and leaks it to another
- Confusing a monthly seasonal dip with a peak
CHART does not recommend securities, funds or trades. Figures can be revised by their publishers. Do your own research and consider regulated advice before allocating capital.
Sources
Every headline number traces to a named publisher. Contextual sources inform the essay, not the key stat.
- 01PrimaryNOAA Global Monitoring Laboratory2026-08-05Trends in Atmospheric Carbon Dioxide — Mauna Loa
July 2026 monthly mean 429.12 ppm; July 2025 427.87. Annual means from co2_annmean_mlo. 2026 on our chart is the July monthly, not a closed annual.
- 02PrimaryCopernicus Climate Change Service / ECMWF2026-01-14Copernicus: 2025 was the third hottest year on record
ERA5: 2025 1.47°C above 1850–1900; 2024 1.60°C (hottest); 2023–2025 average exceeded 1.5°C for the first time.
- 03PrimaryEmber2026Global Electricity Review 2026
2025: renewables 10,730 TWh (33.8%) overtook coal 10,476 TWh (33.0%). Solar 2,778 TWh (+636 TWh).
Keep reading
The first three years above 1.5°C
2024 was the hottest year in the instrumental record. 2023–2025, taken together, were the first stretch to average more than 1.5°C above pre-industrial.
1.47°C
2025 vs 1850–1900 (Copernicus ERA5)
A quieter catastrophe year is not a safer planet
Insured natural-catastrophe losses fell to $107 billion in 2025. Swiss Re still pencils $148 billion if 2026 merely returns to trend. The gap is luck, not adaptation.
$107bn
Insured nat-cat losses, 2025
The century-long reign of coal is ending
In 2025, renewable electricity generated more power than coal for the first time in the modern era. Solar did most of the work.
33.8%
Renewables share of world electricity, 2025