> A slow-moving emergency is lapping at California’s shores— climate-driven sea-level rise that experts now predict could elevate the water in coastal areas up to 10 feet in just 70 years, gobbling up beachfront and overwhelming low-lying cities.

There is a map that show what part will be flooded with an increase of 10 feet. It's not the whole state. Some cities will be fine. Some cities will be doomed.

> A consensus of scientific research makes catastrophic projections that, in the worst case, will be reality by the end of this century: [...] More than 42,000 homes in California will be under water—not merely flooded, but with seawater over roofs.

For comparison, there are like 40 million people living in California, so a good guess is that there are 10-20 million of homes there. So 42,000 sink homes are only 0.5%-0.25%, but it's a lot if it's your home.