Also, if, like me, you're in your 30s or less, you're probably going to live for another 50 years or so.
And that puts you in a range where you will be seeing significant consequences, in coastal cities and regions. When we talk about sea levels rising by a couple feet, that doesn't seem too threatening, on its own, but you can't take it on its own.
Because the issue isn't where a normal high tide reaches.
It's when you get a spring tide (these happen right around new/full moons, when the Sun and Moon's gravitational pull line up, leading to higher tides), plus an oncoming storm, one that's stronger than most from years past. Because storms are indicative of low pressure systems That low pressure is low air pressure, and while it doesn't seem like a lot, when it's acting on scales like weather does, it "pulls" the ocean up a few feet.
This is basically what happened in New Orleans during Katrina, and in NYC during Sandy. Big storm + high tide = higher sea levels than infrastructure can handle = massive flooding. We aren't talking about when NYC is New Venice and the streets are all canals all the time, we're talking about combination events that lead to overtopping existing infrastructure.
And sure, we can build better infrastructure. But that takes money. And if we're poo-pooing the effects, it doesn't get spent. There's a reason NYC is looking at investing $10 billion or so in a new seawall. Because this isn't theoretical any more, it's already happening.
It doesn't mean we're doomed, or anything ridiculous like that. But we need to start adapting our cities to respond to the coming changes. It's foolish to wait until after the disaster.