Two hazards threaten the city's progress -- income inequality and climate change, Mayor Bill de Blasio said Monday night.

"Many people speak about income inequality in moral terms, but there is a pragmatic aspect," de Blasio said at a conference, noting that when the gap between rich a poor widens and the middle class erodes, "the stability of the whole system is threatened."

He also said that Superstorm Sandy weather-wise was "the worst case scenario" but added officials are taking steps to prepare for extreme weather events.