11/30/2025
"I repeatedly see people claiming that climate models are hopeless at predicting future warming. So I thought I'd supply a short history of predictions:
1. Fourier (1820s–1830s)
What he predicted:
The Earth should be much colder given its distance from the Sun. Something in the atmosphere must trap heat.
Accuracy:
Conceptually right. He identified the greenhouse effect before the term existed.
2. Tyndall (1859–1863)
What he discovered:
CO₂, water vapour, and methane absorb infrared radiation. Changing their concentration would change climate.
Accuracy:
Spot on. His laboratory measurements stand today.
3. Arrhenius (1896)
What he predicted:
Doubling CO₂ would warm the planet by about 4–6°C.
He even calculated the warming effect of coal burning.
Accuracy:
Astonishingly close. Modern estimates put the sensitivity at 2.5–4°C.
He was within a degree or so using pencil-and-paper maths.
4. Callendar (1930s–1950s)
(Pioneer of modern climate science)
What he predicted:
Industrial CO₂ emissions were already warming the planet.
Estimated climate sensitivity around 2°C.
Accuracy:
Broadly right. He underestimated aerosols (cooling), but his warming signal matched later observations.
5. Revelle & Suess (1957)
What they predicted:
Human emissions would accumulate in the atmosphere and raise global temperatures.
Accuracy:
Correct. This led directly to the Keeling Curve.
6. Keeling Curve (1958– )
Not a prediction — a measurement — but it underpins all modern predictions.
What it showed:
CO₂ rising exactly as expected from fossil-fuel use.
Accuracy:
Perfect record for 65+ years.
7. Manabe & Wetherald (1967–1975)
Early climate models.
What they predicted:
CO₂ increases lead to surface warming
Stratospheric cooling
Polar amplification
Greater warming over land
Accuracy:
These predictions have all occurred exactly as forecast.
8. Charney Report (1979)
First major international scientific review.
What it predicted:
Climate sensitivity: 1.5–4.5°C.
Significant warming by the 21st century.
Accuracy:
Still the accepted range today.
Charney’s central estimate is almost identical to the IPCC’s.
9. Hansen (1981, 1988)
NASA’s breakthrough modelling.
What he predicted:
Strong warming by the 2000s
Arctic amplification
More heatwaves
Ocean heat uptake
CO₂ would be the dominant factor
Accuracy:
Remarkably high.
His 1988 “Scenario B” prediction matches observed warming almost perfectly.
10. IPCC First Report (1990)
What they predicted:
~0.3°C per decade warming if emissions continued.
Sea-level rise accelerating.
Accuracy:
Very good.
Observed warming has been about 0.2°C per decade — lower because emissions followed a gentler path than the “high” scenario.
11. IPCC 2001–2021 (AR3 to AR6)
Increasingly sophisticated models.
What they predicted:
Continued warming
More extreme heat
Intensification of hydrological cycle
Arctic sea ice decline
Ocean acidification
Rising sea levels accelerating
Tipping points possible at high warming
Accuracy:
High.
The big-ticket predictions — warming, ice loss, ocean heat, sea level — have all come true, most within model uncertainty ranges.
Some changes (Arctic sea ice decline, ocean heat content) happened faster than predicted.
So, how accurate have climate predictions been overall?
In summary:
Which predictions were right?
CO₂ warms the planet (Fourier, Tyndall, Arrhenius)
Human emissions would raise atmospheric CO₂ (Revelle, Keeling)
The globe would warm steadily (Arrhenius to IPCC)
Ice would melt fastest in the Arctic
Oceans would warm and acidify
Sea levels would rise and accelerate
Heatwaves would intensify
Nights would warm faster than days
The stratosphere would cool
Heavy rainfall events would increase
Which predictions were too slow?
Arctic sea-ice loss
Ocean heat accumulation
Some glacier retreat
Some extreme weather trends
Which predictions were too pessimistic?
Almost none.
If anything, the mainstream science has been cautious.
Conclusion
Climate predictions, from the 19th century to today, have been:
Consistent
Physically grounded
Surprisingly accurate
Often conservative
The denial narrative that “scientists keep being wrong” collapses under even the briefest look at the history. Scientists have been right about global warming for over 125 years — and the warming itself has validated their work again and again."
(Seen in "Climate Change - An Open Discussion" with permission to copy/pasta:
https://www.facebook.com/share/p/1GMRnpBALj/