Startups are finding novel ways to recycle carbon

Capturing carbon dioxide (CO2) from the air will be a crucial part of efforts to slow climate change. Many projects envisage piping the gas to some form of permanent storage (such as salt caverns). Oil companies, which have experience of pumping CO2 into dwindling wells in order to enhance oil recovery, claim to be keen. But less attention has been paid to the many other commercial possibilities. In the group of technologies referred to as carbon capture, utilisation and storage (CCUS), utilisation often gets short shrift.