The "basic math" here is straightforward: 100 tonnes of carbon in fuel. 50 are captured, 50 go to the atmosphere. If more than 50 tonnes originally came from t

The "basic math" here is straightforward: 100 tonnes of carbon in fuel. 50 are captured, 50 go to the atmosphere. If more than 50 tonnes originally came from the atmosphere recently, then the net flow to the atmosphere is negative. There may be other issues with carbon capture (its expensive, doesn't necessarily prevent other pollutants, can be part of a greenwashing scheme). But snark about math isn't useful, especially when you are wrong.