I'm not entirely convinced that anything we do at this point can save us – or rather, save modern industrial society.
The human race will likely be fine in almost any scenario except some sort of Venus-like hellscape (which probably isn't as unlikely as we'd like to think…), but we've set in motion such enormous changes that the damage is already done even if we went carbon negative right at this very second, so personally I think it's unlikely that current mass-scale industrial society will survive a 100 years or that we'll be able to avert billions of deaths.