We Are In A CO2 Famine - CO2 Has Been Declining for 160 Million Years - Excellent Graph

X ^ | 14 September 2025 | Peter Clack on Twitter

[zeestephen]

The CO2 red line for plant death on Earth is around 150 ppm...During the last Glacial Maximum (20,000 years ago) CO2 was 180 ppm...The optimum CO2 level for plants is around 1,000 ppm...CO2 today is 422 ppm...

[Windcatcher]

The warmer temperatures from increased CO2 also means more ocean evaporation, which results in increased rainfall, which results in increased plant growth. Having more plants supports more herbivores, which supports more carnivores. During the time of the dinosaurs there was overall much more life on earth due to the warmer, wetter climate that came with increased CO2.

It’s almost as if the climate zealots are *trying* to kill off all life on Earth.

[Texas Eagle]

"THE TREES ARE ALL GOING TO DIE!"

If they do, what happens to the CO2 that they have absorbed but haven't converted to oxygen? It's released into the atmosphere!

It's almost as if somebody or something or some form of intelligence thought this all through.

[Texas Eagle]

😆 👏 👏 👏

🍻

[tcox4575]

The writer begins with a false premise - an old earth. No accurate conclusions can come from incorrect data.

[A Formerly Proud Canadian]

Supper tonight, is leftover home made beans and perhaps, a beer to drink. That should help.

Friday’s stir fry will include cabbage!

Since I don’t smoke, there should be no problem with a methane explosion.

[NonValueAdded]

Hire those guys with the backward knees to replenish the supply. /Obscure

[cuban leaf]

It’s sort of a CO2 sink. It both absorbs and releases it, depending on the situation.

[NonValueAdded]

It’s almost as if the climate zealots are *trying* to kill off all life on Earth.

Yes, starting with us ..

[Windcatcher]

It’s possible that none of the other gases might be in decline. As Earth warms back up to pre-Ice Age levels, I would expect the overall atmosphere to thicken.

[zeestephen]

Re: "The writer begins with a false premise - an old Earth. No accurate conclusions can come from incorrect data."

The real question...

Why did God create so much age deceptive evidence?

[plain talk]

We are in an interglacial cycle right now. The previous interglacial cycle was Eemian about 130K to 115K years ago. Seas were 30 feet higher and polar temps were 40 degrees warmer.

One doesn’t need high CO2 to produce higher temps and seas so this focus on CO2 is a bit misguided and only represents one component in the equation.

https://en.wikipedia.org/wiki/Last_Interglacial

[_longranger81]

After Hugh school I went to Series college.

[GingisK]

I am also a major methane contributor; and, we both can be proud of it!

[Tom Tetroxide]

Did you have to excerpt this Twitter entry by Peter Clack?

[Tom Tetroxide]

"Ehhhhhhh. Where did it go?"

Converted to O2 by plants on land and phytoplankton in the ocean.

The source of most of the CO2 in the Earth's atmosphere is by volcanic eruptions. Over the billions of years there have been less and less eruptions to the point we are living in the most seismically quiet period in the Earth's history.

If you look at this graph, you will see that over 500 million years ago the CO2 level was nearly 8,000pppm!



This also happens to be the longest inter-glacial period during this Holocene we know of for the past 850,000 we have ice core data for. At any time we could easily go back into the 2.5 million-year ice age at any time.

[Tom Tetroxide]

Here's the graph again.

[Tom Tetroxide]

Atmospheric Carbon Dioxide (CO2) levels, 1800–present

https://sealevel.info/co2.html

[Vaduz]

Yes, trees use carbon dioxide from the atmosphere for the process of photosynthesis, a process where they convert carbon dioxide, water, and sunlight into sugars to fuel their growth and release oxygen as a byproduct.

Hey Moe they’re using to much of it?.

[Cobra64]

It does.

[TangoLimaSierra]

Damn you, autocorrect! Will I never be rid of you!?

There's an app for that. Proofreading.