That's because you have a working assumption there's something we can do about it.
I don't believe there is: in that regard, humanity is as much in control of its own destiny as a mold colony growing on a slice of bread under a glass dome.
To wit: we have been incapable of solving basic problems like ending hunger or war for our entire history. There is zero reason to believe we can actually do anything about something much harder like global warming.
What will happen is what seem to happen to all form of life on planet Earth throughout history (e.g all life before stromatolites started pumping highly poisonous oxygen into the biosphere, or dinosaurs and whatever put them down, etc...): we will go through a cataclysmic, extinction-level event.
What will come out the other side will likely still be life, but unlikely be human, or if it is, vastly changed.
And you can pump out as much empathy as you'd like. As has been repeated ad nauseam, the physical world doesn't give two hoots.
If a solution exists to global warming, it's expansion, nothing else. Musk is correct in that regard.