One of the biggest long-term impacts of climate change is sea level rise. Even in more moderate emissions scenarios we likely commit the world to many meters of future sea level rise over the next millennium – barring massive anthropogenic carbon removal in future centuries. 
The folks at @ClimateCentral have an evocative new visualization of what sea level rise over the next ~1000 years would look like if it happened to cities today. They focus on a 3C warming case – consistent with best estimates of current policy outcomes: picturing.climatecentral.org
Of course, 1000 years is a long time. Who knows what our cities (or species) will look like that far in the future, what actions we might be able to take to slow down or reverse ice sheet loss, or what infrastructure we may build to hold back the rising seas.
But regardless, we are choosing to leave quite a mess to future generations if we do not rapidly mitigate emissions. The difference between future sea level rise commitments in a below-2C and a 3C world is quite massive. The choice is, ultimately, up to us.
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