Bronze Age Optimum

A warm period following the Middle Bronze Age age cold period.

The CO2 theory in any form

Either the "carbon dioxide climate theory" or the "carbon dioxide theory of climate change", (they mean the same thing), you won't find the theory on Wikipedia.

Isn't that incredibly strange?

Extended entry on this is here

Boreal winter, boreal summer, still no entry

The terms are used of course, it's just that there is no entry or explanation of them.

Example

 The NECC has a pronounced seasonal cycle in the Atlantic and Pacific, reaching maximum strength in late boreal summer and fall and minimum strength in late boreal winter and spring. Furthermore, the NECC in the Atlantic disappears in late winter and early spring.^[2]

Here's how easy it is to explain it when using it.

The missing sink is still missing from Wikipedia

Missing Carbon Sink

Missing sink

Still missing from Wikipedia

Even when it appears as a source on Wikipedia

Criticality

I know, hard to believe.

Criticality is a nuclear term that refers to the balance of neutrons in the system. “Subcritical” refers to a system where the loss rate of neutrons is greater than the production rate of neutrons and therefore the neutron population (or number of neutrons) decreases as time goes on.

Scientific explanation

The Holocene temperature conundrum (edited May 5 2021)

The paper (no longer works)  The paper --> archive.org ... another link to the paper

Nature News article

"The question is, 'Who is right?'" Liu said. "Or, maybe none of us is completely right. It could be partly a data problem, since some of the data in last year's study contradicts itself. It could partly be a model problem because of some missing physical mechanisms."

space.com article (archived)

This mystery is known as the "Holocene temperature conundrum," and it describes a debate that has gone on over how temperatures have changed during the Holocene, an epoch that describes the last 11,700 years of our planet's history. While some previous proxy reconstructions suggest that average Holocene temperatures peaked between 6,000 and 10,000 years ago and the planet cooled after this, climate models suggest that global temperatures have actually risen over the past 12,000 years, with the help of factors like rising greenhouse gas emissions and climate change.

A blog 

(mentions the Holocene Maximum, also called the Altithermal, something also not found on Wikipedia)

Another blog 
"The fact that all the world’s complex and expensive climate models can’t explain climate change since the last glacial period ended is one of the little talked about embarrassments of climate science."

Google scholar

Paleoclimate: The End Of The Holocene By Stefan Rahmstorf

The Holocene temperature conundrum, not found on Wikipedia

The paper is about climate models vs estimated global temperature trends.  

Pictures of the Zhangye Danxia Mountains

While Wikipedia does have an entry for the  Zhangye Danxia National Geological Park, there is no picture of how awesome the mountains are.

(click image for source and more photos of very cool places)

Google images for more awesome images