Norfolk, Va. (Photo by Sharon.)

When the presidential candidates talk about the long-term economic security of the U.S., they often talk about the national debt, the viability of Medicare and Social Security, and the rise of China.

But there’s another issue that could have major implications for the nation’s economy, and it’s barely mentioned at all: the soaring costs America might face in generations to come from climate change. More specifically, the very damaging and very costly effects of sea-level rise.