Why the hell should anyone care about abstract "people"? Most of Humanity isn't wired that way, we care about those we know, not about the distant future and people we don't know.
There, fixed that for BOTH of you.
Human technologies have evolved orders of magnitude faster than the human brain has. Most people are still cavemen inside their skulls, cavemen with ICEs and smartphones and handguns and bombs, and they act like it, too. Most people don't really care about the abstract 'someone' on the abstract 'other side of the planet', and in fact this little ball of mud we're living on is also too large for their caveman brains to really comprehend. So is the concept of '100 years from now'. Most people don't really think much past a few months in the future, except in the most abstract sort of way, and don't really think too hard about people outside their own social circle. You tell them 'you need to sell your car and take public transit, ride a bike, or walk, to help stop air pollution and global warming', and they look at you like you're nuts and are trying to ruin their lives. You tell them to conserve resources, and they might for a while, if you're lucky -- then they're back to their old habits. And so on. And this is just 1st World Countries I'm talking about. You go somewhere like China or India or African nations and they'll laugh at you, if they don't attack you. IF we survive the next, say, 1000 years, our brains and 'civilization' (using the term loosely here) might catch up with each other and with technology, and we MIGHT save ourselves. But as things sit right now? Forget about it. We can't even stop fighting amongst ourselves for the stupidest reasons imaginable, let alone cooperate on not wrecking the entire planet. Worse, there are superstitious types who think some Invisible Sky God created it all, and will come down to whisk the Faithful away to some paradise, so who cares what happens to the Earth? Then there's the ones that seem to think that the Invisible Sky God is angry because some people aren't living according to some old book, and is making all this happen to us (which of course is more bullshit), and as soon as the Unbelievers and Infidels are all dead, it'll go back to being nice again. Or whatever. If we, as a species, manage to survive the next 100 years, it'll be a miracle.