We had a discussion at work yesterday about what it would mean if sea levels rise, possibly up to 20 feet, in our children’s lifetime if not ours. What would Boston look like, or the southern Atlantic and Gulf coasts? One person insinuated that a lot of rich people in our area would be in trouble - think Cape Cod, Back Bay - to which my boss responded, “No, those people have cars. They’re fine.” So what will this do to other parts of the world where people are often way more crowded along the coasts than we are?