Well, their children will, anyways. This is one of the tragedies of climate change - the people most fucked will be the ones with the least amount of impact on the problem (in that it'll be future generations, but also people living in countries that aren't big greenhouse gas producers).
It's not just four, though, really. It's not going to linearly add on to current temperatures (which would be bad enough some places). It's going to be uneven spikes (geographically and temporally), changes in weather patterns, previously stable global systems and humidity. Then you have to explain things like "wet bulb" temperatures, and how even a small increase can end up being deadly...
At this point it's a fable useful as a metaphor rather than something people actually believe in, surely?
I hate to be a downer, but it is too late. What we're doing now, we should have done 20 or more years ago, when it might have had a chance of stopping the 2 degree warming. At this point, best case scenario, the warming will happen (and possibly more), it's going to get pretty nasty and it's going to cost a lot (both financially and in human lives) to both deal with it and keep it from getting even worse. This is not a call to throw up our hands and give up and do nothing, however - if we keep going as per usual, we're completely and totally fucked and there will be no practical way of undoing the damage.