August 31, 2026 ยท Tags: climate, energy, carbon-capture, technology
The world has spent $40 billion on carbon capture and storage. It currently captures less than 0.1% of annual global CO2 emissions. That gap tells you most of what you need to know.
How It Works #
Carbon capture pulls CO2 out of industrial exhaust streams using chemical solvents (usually amines), compresses it into a liquid-like state, and pumps it deep underground into porous rock formations. The three main approaches are post-combustion (scrubbing exhaust after burning), pre-combustion (capturing CO2 from syngas before burning), and oxyfuel (burning in pure oxygen to produce a nearly pure CO2 stream).
The CO2 ends up in saline aquifers, depleted oil fields, or reacted with rocks to form solid carbonate minerals. The geology matters a lot. The best storage sites have impermeable caprock layers on top that trap the CO2. The IPCC says well-selected sites retain over 99% of injected CO2 for 1,000 years.
The Scale Problem #
As of February 2026, the world has 75 operational CCS projects capturing 62.5 million tonnes of CO2 per year, according to the International Energy Agency. That sounds like a lot until you compare it to the 37 billion tonnes the world emits annually. CCS is handling roughly 0.17% of what we put out.
The pipeline is growing. Another 93 Mt/year is under construction and 1,280 Mt/year is in planning. But CCS has a long history of over-promising and under-delivering. Projects like Boundary Dam in Canada cost $1.5 billion and still struggled with frequent shutdowns because the capture system consumed 20-30% of the plant's own power output.
Where CCS Makes Sense #
Cement and steel production are the strongest cases. You can't make cement without releasing CO2 from limestone. That's chemistry, not fuel choice. The IPCC calls CCS a "critical mitigation option" for these industrial sectors. Steel (8% of global emissions), cement (7%), and chemicals can't fully decarbonize with renewables alone.
For power generation, the argument is weaker. Solar and wind already beat CCS on cost, and they don't consume 25% of their own output just to operate.
What Changed in 2026 #
A few developments this year changed the picture:
Direct air capture costs dropped sharply. A proton-trapping sorbent design from Shen et al. (Nature Communications, July 2026) pushed projected DAC costs to $48-62 per tonne of CO2. That's below the long-standing $100 target and 78% lower than thermal swing adsorption. Source: Nature Communications
Mineral storage hit a milestone. A Saudi Arabian pilot injected CO2-charged water into basalt and saw 70% mineralization within 10 months, using 8-16x less energy than conventional CCS. The innovation was recirculating groundwater instead of trucking in fresh water.
Electrochemical DAC also improved. Two separate advances (MnO2 surface mineralization and redox-decoupled electrolysis) cut energy requirements by 3x and ran stable for 1,000+ hours.
The Controversy #
CCS is genuinely contested. Critics call it a fossil fuel delay tactic. Most captured CO2 today goes into enhanced oil recovery, not permanent storage. A University of Oxford working paper found that a "low-CCS" path to net-zero costs about $1 trillion less per year than a "high-CCS" one.
The carbon capture industry responds that no serious net-zero model reaches its targets without CCS for cement and steel, and that costs fall with deployment the way solar did.
Both sides have evidence. That's where the debate sits right now.
Why This Matters #
CCS is not a silver bullet. It's an expensive, energy-intensive tool that works best in a narrow set of industrial applications. The 2026 breakthroughs in direct air capture and mineral storage are real progress, but they remain at pilot scale. Betting the climate on CCS scaling up 30x by 2035 would be reckless. Ignoring it for cement and steel would also be reckless. The real question is where CCS makes sense that nothing else does.