Last Updated 10.14.26. (G)
Here are the documentation links to the IPCC's underestimation and other errors and issues
Humanity's immediate survival is at stake. We can no longer rely on the IPCC's climate calculations to survive. (Please note: In the links below, we are not attacking or criticizing any of the thousands of hard-working and honest volunteer scientists worldwide who submit their climate research to the IPCC. Instead, we call attention to the IPCC's administrative processes and politicized leadership. They are the ones who appear to alter and contort the real climate science received by these scientists into 5-7 year climate summary reports. Before they are released, these 5-7 year summary reports must get the line-by-line sign-off of the IPCC's major funders, the fossil fuel-producing nations, and the fossil fuel-dependent nations.)
1. Click here to understand how the IPCC has underestimated the consequences, timeframes, and needed global fossil fuel reduction targets by as much as 20-30% or more over the long term.
2, Click here to see precisely how the IPCC literally "cooked the books" and grossly skewed the current IPCC global fossil fuel reduction calculations far lower than they should be by including unproven and non-existent "carbon-sucking unicorn" technology into their projections. This corruption and falsification of global carbon-reduction calculations enabled major fossil-fuel-producing nations and industries to continue operating "business as usual."
3. Click here to see the IPCC's Perfect Day problem with its computer climate modeling. This alone will significantly reduce the accuracy of all of the IPCC's consequence predictions, timetables, and fossil-fuel-reduction remedies.
4. Click here to see the eleven key climate change tipping points that have often been excluded from the IPCC calculations for how much fossil fuel use we must reduce each year globally.
5.Click here to see the four key reasons why the IPCC's 26 global climate conferences have failed to produce results or legitimate global fossil fuel reduction targets.
6. Click here to see the IPCC's huge atmospheric methane calculation problem. This further undermines the reliability and usefulness of the IPCC's climate prediction and mitigation work.
7. Click here to see the latest 2022 IPCC climate change summary report on the critical climate sensitivity error. Due to this ongoing climate sensitivity error alone, the IPCC's latest climate consequence predictions, timeframes, and remedial action information may be underestimated by as much as 25% or more. (This 25% does not include the effect of the other IPCC errors described in the links just above.)
8. Click here to view a new study showing that the IPCC omits several crucial climate-system factors from its computer climate models. Those missing factors produce incorrect, distorted outcomes. This February 2022 paper strongly refutes the absurd IPCC claim that the decline in Arctic sea ice melt is reversible. It is not reversible, and that is a monster problem for humanity's weather, seasonal climate, and future!
9. A major climate change study says the IPCC has a serious underestimation problem because it underestimates equilibrium climate sensitivity (ECS). The IPCC has been using an ECS of 3.0 for decades. This difference matters because ECS is a constant used to calculate many of the most important climate-change temperature-increase time frames and consequence frames. The relevant findings from this new study include:
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- An estimated equilibrium climate sensitivity of 4.8°C ± 1.2°C per doubling of CO₂.
- An argument that aerosol cooling has masked more greenhouse warming than the IPCC’s best estimates imply.
- A projected acceleration of warming as aerosol pollution declines.
The authors explicitly state that their concern is that the IPCC has underestimated climate sensitivity and understated certain major risks. academic.oup.com
A 2025 follow-up, added more recently, is Global Warming Has Accelerated: Are the United Nations and the Public Well-Informed?, also by Hansen and colleagues. Read the authors’ full paper here. columbia.edu
The 2023 paper supports investigating underestimation of specific climate quantities. It does not independently establish a universal 20–40% correction to every IPCC forecast or timeframe.
We strongly recommend starting with this article: Hansen, J. E., et al. (2023). Global Warming in the Pipeline. Oxford Open Climate Change, 3(1), kgad008. Published November 2, 2023. DOI: 10.1093/oxfclm/kgad008
The above 2023 IPCC climate change report is terrifying. But unfortunately, the IPCC still isn't disclosing that our climate future is considerably worse than they are willing to admit!
Here is the crucial corrective information you need to reach a higher level of climate-fact accuracy than the IPCC's newest report. Their statement is the A statement. Ours is the B statement. The B statement corrects or adds to the IPCC's latest report to achieve higher climate accuracy.
Example 1:
a) The report indicates that extreme weather events associated with climate change, such as floods and heatwaves, are impacting humans and other species more severely than previously assessed.
b) This is due to the IPCC's past assessments being underestimated by as much as 20-30 percent, primarily due to a myriad of issues related to IPCC politicization and calculation errors, as discussed in the documentation links on this page.
Example 2:
a.) The IPCC reports spell out how the world must take ambitious climate action within this decade to keep warming to within 1.5 degrees Celsius above preindustrial temperatures. That requires decreasing carbon pollution by 45 percent from 2010 levels by 2030 and reaching net-zero carbon emissions by 2050.
b.) The truth is we must reduce total global fossil fuel use by 75% by 2025 to prevent the extinction of half of humanity by mid-century. If we are lucky enough to do that, we might keep the average global temperature increase to 1.9 °C to 2.5 °C.
Example 3: (Every coastal city worldwide should take notice and start preparing!)
a.) The IPCC predicts about a 1-foot global sea-level rise by 2050.
b.) By 2050, global sea levels will rise by 2-3 feet and by as much as 7-9+feet by 2100.
Example 4:
a) The IPCC states that humans and nature are being pushed beyond their ability to adapt. Still, a brief window remains to avoid the worst of climate change.
b.) That is true, but the critical information they omit is that loss of our ability to adapt will happen within the next 3-9 years because our last window of opportunity to control our climate futures will also close within the next 3-9 years!
Example 5:
a.) The IPCC also says that many of the impacts of global warming are now simply "irreversible."
b.) That is true. But again, the IPCC fails to tell us that because we squandered six decades when we should have been steadily cutting global fossil fuel use, the die-off of half of humanity by mid-century is now unavoidable, no matter what we do!
Example 6:
a.) Over 40% of the world's population is "highly vulnerable" to climate change.
b.) Within the next 3-9 years, over 70% of the world's population will be experiencing an exponential explosion of climate consequences, for which there is grossly insufficient preparation or resilience.
Decades of errors, calculation mistakes, and polarization mean the IPCC is not a fully reliable source for accurate climate change information. Their climate consequence predictions, timeframes, and remedial action information are grossly underestimated by 20 - 30 %+ and possibly more!
What can you do about the climate emergency?
Click here and select the action plan that is best for your situation and resources.
Click here to sign the climate change emergency petition!
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