I'd rather stop immigration before further driving our birth rates down and leaving world of the future to the low intelligence populations that are currently driving population growth on a global scale. The only ones following this "don't have children because of the climate" advice are those intelligent enough to do so. The whole thing is completely dysgenic in its nature.
The world isn't black and white.
Having more children than we need is why we're in this whole mess to begin with. If people stuck to having 2-3 kids instead of 4-5, we'd have a much longer runway to transition to renewables, including building up storage capacity.
Instead, we're scrambling and calling transitioning from coal to natural gas a success, when it's just changing 1 fossil fuel for another, while the world is burning (quite literally, in some parts) around us.
But I care deeply about the mess we’re leaving for my nieces and nephew, and for many of my friend’s children.
And, quite frankly, saying “not fucking up a planet is a meaningless exercise” if it doesn’t happen to allow _your_ precious DNA to survive? That’s not the sort of awful person I’d admit to being in public...