Good News! We can Nuke to our heart's content... "blast wouldn't destroy city"

http://www.sfgate.com/cgi-bin/article.cgi?f=/n/a/2012/03/27/national/w003933D74.DTL

Thinking about the unthinkable, a U.S. government study analyzed the likely effects from terrorists setting off a 10-kiloton nuclear device a few blocks north of the White House. It predicted terrible devastation for roughly one-half mile in every direction, with buildings reduced to rubble the way that World War II bombing raids destroyed parts of Berlin. But outside that blast zone, the study concluded, even such a nuclear explosion would be pretty survivable.

"It's not the end of the world," said Randy Larsen, a retired Air Force colonel and founding director of the Institute for Homeland Security. "It's not a Cold War scenario."

/snip

See? It's "pretty survivable".