It's not about sacrifices, it's about evolving socially and economically. When the car was invented do you think it was an easy thing transitioning from a society that depended on animal labor to a society that utilized the combustion engine?
And do you think everyone managed the switch simultaneously or were some nations better suited to go first and then the rest followed???
The 3rd world is not equivalent to the 1st world socially or economically or technologically. Do I really have to make this point? So it is impossible for them to be on the same time scale as us. 1st world got computers in the 1990s, 3rd world got them 20 years later. 1st world got cell phones in the 90s, 3rd world got them 20 years later...
Same thing with a new energy resource and paradigm.
I don't think you understand the history of man at all. Part of being human is having the ability to adapt to one's surroundings. On every corner of the planet, humans have been able to adapt and change to accomplish the task of survival.
What I feel that you are failing to grasp is that severe environmental impacts like the world's coral reefs dying have a "potential" to lead to catastrophic effects to the entire world. The world's biosphere is so complex that our current level of science doesn't quite know how to model it. We are all linked together and something like the coral reefs all dying off in a short period of time (decades not centuries) is something that literally could lead to a cascade effect that fundamentally hurts every living organism on the planet.
So yeah, this is a big deal.
I dunno, maybe we old crusty types just don't care because we'll be dead in 20, 30, or 40 years and we don't care what mess we leave our children and grandchildren...
So we lie to ourselves, downplay it, tell ourselves that it is just "scaremongering" so we can go on earning stock dividends or not have to change our standards of living and way of life.
Just kick that can down the road and let our grandchildren and their grandchildren deal with the consequences of our laziness and selfishness