A great deal of climate discussion uses the words capture, removal, and recycling almost interchangeably.
From a process-engineering perspective, they describe very different things.
Carbon capture asks:
Can we separate CO₂ from an industrial gas stream before it reaches the atmosphere?
That is an important first step. But capture alone does not answer the next question:
Where does the captured carbon go?
If it is compressed, transported, and permanently stored underground, we have created a carbon capture and storage pathway.
Carbon removal asks a different question:
Can we remove CO₂ that is already in the atmosphere?
Direct Air Capture, enhanced mineralisation, and biological approaches are examples. Again, the carbon needs a final destination after it has been removed.
Carbon recycling asks something fundamentally different:
Can we prevent carbon from becoming a one-way material flow in the first place?
Consider methane used for energy:
CH_4 \rightarrow Energy \rightarrow CO_2
In the conventional system, the carbon journey effectively ends with CO₂ entering the atmosphere, being captured for storage, or requiring subsequent removal.
But CO₂ still contains the carbon atom that originally entered as methane.
If we supply renewable hydrogen:
CO_2 + 4H_2 \rightarrow CH_4 + 2H_2O
The carbon can be returned to methane and used again.
The pathway becomes:
CH₄ → Energy → CO₂ → CH₄ → Energy → CO₂ → CH₄
Now carbon is being treated as a circulating process material, while renewable hydrogen supplies new energy to the cycle.
The same question applies to industrial syngas.
If carbon monoxide is used as a reducing agent:
FeO + CO \rightarrow Fe + CO_2
The process may have successfully reduced the iron oxide, but the carbon has not disappeared.
It has simply moved from CO to CO₂.
So describing a process as using syngas does not, by itself, tell us whether the carbon problem has been solved.
We still have to ask:
What happens to the CO₂?
This is why CEWT believes carbon accounting should be approached in much the same way as a chemical engineer approaches a mass balance.
Draw a boundary around the process.
Identify every carbon-containing feed.
Identify every carbon-containing product.
Identify every recycle stream.
Identify every purge, vent, and fugitive loss.
Then close the carbon balance.
This leads to a very simple distinction:
Carbon capture separates the carbon.
Carbon removal retrieves carbon from the atmosphere.
Carbon recycling gives captured carbon another useful cycle.
None should be confused with the others, and each may have a role.
But for industrial processes, perhaps the first question should be even simpler:
Does every carbon atom entering the process have a defined destination?
If we cannot answer that question, the carbon balance is not yet closed.
At CEWT, that is the principle behind our Carbon Recycling Technology:
Every molecule has a destination.
Carbon should be no exception.
