CO2 is a strange gas. This matters as energy transition will require over 120 GW of compressors for 6GTpa of CCUS. This 13-page note explains CO2’s strange properties, which helps to fine-tune appropriate risking factors for vanilla CCS, blue hydrogen, CO2-EOR, CO2 shipping, super-critical CO2 power cycles. There is also a wide moat around leading turbomachinery companies.