Category: Carbon Capture and Storage

Nineteen years ago, on this day, August 8th, 2006. MIT Review has a story on, well, “Storing Carbon Dioxide under the Ocean” calling it a “A safe, high-capacity method could make carbon sequestration more practical.” 

God forbid breathless technophilia ever infect people’s cognitive faculties…

One way to combat global climate change is to directly capture carbon dioxide, the main greenhouse gas, as it is being emitted, and store it safely. But methods of carbon dioxide sequestration, notably, pumping the gas into underground geologic structures such as exhausted oil reservoirs, are not practical in many areas, and raise fears that the stored carbon dioxide will escape.

A better way to store carbon dioxide: Pump it into the sea floor in liquid form. There,high pressure and cold temperatures make it more dense than water in the surrounding rock, preventing it from rising to the surface. (Source: Daniel Schrag. Artist: Jared T. Williams)

Now researchers at Harvard University and Columbia University have proposed a new method for trapping nearly limitless amounts of carbon dioxide – a technique they say will be secure, as well as a practical option for areas located far from underground reservoirs.

The researchers, in an article posted online this week in the Proceedings of the National Academy of Sciences, propose that carbon dioxide be pumped into the porous sediment a few hundred meters into the sea floor in deep parts of the ocean (greater than 3,000 meters deep), in what one of the researchers, Dan Schrag, professor of geochemistry at Harvard, calls “a fairly simple, permanent solution.”

The key was finding a “sweet spot,” where the pressure and temperature of the surrounding environment make carbon dioxide more dense than surrounding fluids, thereby trapping it in place. This situation occurs at the bottom of the ocean because of a combination of high pressure and low temperatures – a fact others have also noted in proposals to store carbon dioxide in deep parts of the ocean.

Storing Carbon Dioxide under the Ocean | MIT Technology Review

The amount of carbon dioxide in the air was 382ppm. As of 2025, when this post was published, it is 430ppm. This matters because the more carbon dioxide in the air, the more heat gets trapped. The more heat, the more extreme weather events. You can make it more complicated than that if you want, but really, it’s not. Fwiw, I have a tattoo of the Keeling Curve on my left forearm.

The broader context was that from the mid-1970s various scientists had been saying “well, look if carbon dioxide build-up is actually a problem, we will just bury it in/under the oceans. Simples.”

The specific context was that the carbon dioxide build-up issue was back on the agenda because the Kyoto Protocol had come into effect – despite US and Australian intransigence – in February 2005. This meant that there would be a successor deal, and the rich countries wanted to be able to say “tech will fix it” to dodge calls for emissions cuts by rich people.

What I think we can learn from this is that we believe what is convenient to believe, and disregard the rest (yes, that’s a Simon and Garfunkel hollaback).

What happened next – the CCS bandwagon lost a wheel in 2011 or so. This has since been duct-taped back on, at considerable expense to the taxpayer.

What do you think? Does this pass the ‘so what?’ threshold? Have I got facts wrong? Interpretation wrong? Please do comment on this post, unless you are a denialist, obvs.

Also on this day: 

August 8, 1975 – first academic paper to use term “global warming” published

August 8, 1990 – Ministers meet, argue for Toronto Target

August 8, 1990 – ANZEC says “adopt Toronto target” of sharp carbon cuts. – All Our Yesterdays