Typo:

> You can do two things with carbon: you can capture it, or you can use it. Both are hard, but the latter is harder, mainly because carbon dioxide is so small.

You can either store (CCS: "Carbon Capture and Storage") or/and use (CCU: "Carbon Capture and Utilization") it.

Fixing the typo:

> You can do two things with carbon: you can store it, or you can use it. Both are hard, but the latter is harder, mainly because carbon dioxide is so small.

Also, probably wouldn't say that it's hard because CO2 is small. Instead, probably just say because [it's got a low enthalpy](https://politics.stackexchange.com/questions/30089/why-is-th... ). Otherwise, it'd be like saying that water's hard-to-use because H2O is small, or that gold's hard-to-use because Au is small.