The East Village.
jesseandgregThe East Village after Hurricane Sandy.

Since the 2007 release of PlaNYC, New York City Mayor Michael Bloomberg’s sustainability vision, the city has chipped away steadily at its carbon emissions, cutting them to 13 percent below 2005 levels already. But nothing New York does on its own to mitigate climate change can save the city from future Sandys and the sea-level rise that will make such storms even more destructive going forward.

Last week, Bloomberg unveiled an ambitious, expensive plan to fortify the city against the kind of extreme weather that’s fast becoming the “new normal.” The event amplified a message more local leaders are embracing: Climate change is already upon us, and adapting to it will be essential to prevent massive losses of money and life.