The variance is tricky because of the enormous time range and the huge number of variables. It's also impossible to account for any black swans, positive or neg

The variance is tricky because of the enormous time range and the huge number of variables. It's also impossible to account for any black swans, positive or negative, that might happen in the next 80 years. We have no idea if some miraculous carbon removing technology will be discovered that saves us all. Or if we're missing some key component to the puzzle and actually we'll be extinct by 2050.