There's a lot of stuff that you simply can't prevent from emitting CO2, for example various chemical processes, and other applications like air travel where fossil fuels are simply too much better than alternatives. True zero emissions is not a realistic goal. But net zero emissions is much more reasonable - you can still use carbon where you need it, you just need to make up for it.

The goal isn’t net zero new emissions, it’s net zero emissions, so sequestering every bit of CO2 you emit