Maybe there is a way to get -10% without paralyzing the economy. But nobody is looking. Or they’ve devices that it’s “too expensive” to invest in tech that will save 10% later.
If we continue to do nothing effective, the economy will be paralyzed by 100%.
We could get to net negative, just with carbon capture, for less than Iran is costing us. (Atmospheric carbon capture, if scaled, would cost ~ $1-2 to capture a gallon of gasoline's CO2 emissions).
Of course, that's one of the dumbest ways to get to carbon neutral. Solar and wind + batteries cost less than internal combustion engines, yet they're somehow "too expensive" and would cripple the economy.