Let me explain more, so you can understand just how absurd you are being.
There are many things that would not end civilization, but would still be extremely horrible. For example, snapping my fingers and killing half the people alive would not end civilization. To pretend that use of fossil fuels would have to end civilization before it would be proper to ban them is the height of dishonest idiocy.
Yes, fossil fuels provide benefits. But the cost of replacing them is not THAT large. The price, in fact, is less than the damage that continued use of fossil fuels is likely to cause. Human ingenuity has offered many good ways to substitute low or no CO2 processes for raw fossil fuel consumption.