The most common capture technologies involve running the gas to be processed through a solution of amines or ammonium carbonate.

ECONOMIST: Carbon capture and storage

The carbon-rich solution, meanwhile, is treated in a separate vessel to release its burden of CO2, which can then be piped away and stored, and the amines or ammonium carbonate thus liberated recycled.

ECONOMIST: Carbon capture and storage

At the other Alstom, a French concern, has 18 months to test the ammonium-carbonate process.

ECONOMIST: Carbon capture and storage

Amine- and ammonium-carbonate-based CCS are not, however, the only ways to do things.

ECONOMIST: Carbon capture and storage