One way that you can make this point is to compare it with automobiles. We know for sure that driving a car or riding in a car is relatively more dangerous than most things we do. Yet we do it every day. The real issue here is that we fear big catastrophes because they seem so much scarier than little ones that add up. Think of fossil fuels as car crashes -- the dangers seem minor but they add up to something quite serious.
So, I agree with the others. You need to write about the sorts of safety precautions that should be taken to make things as safe as possible. But you also need to point out that there is no such thing as complete safety and that the alternatives are not any better.