Brian Chappatta, Columnist

Climate Change Is Coming to Your Hometown Bonds

Startup risQ wants to be the go-to tool to assess natural-disaster risk in the municipal market.

Pinning down global warming risk has always been elusive for the muni market.

Photographer: Joel Saget/AFP/Getty Images

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In some corners of finance, climate-change risks are only starting to appear on investors’ radars. By contrast, in the $3.8 trillion U.S. municipal-bond market, natural disasters have been a nagging concern for decades.

In the wake of Hurricane Katrina in 2005, Moody’s Investors Service slashed New Orleans’s credit rating by three levels to junk. It didn’t win backBloomberg Terminal its investment grade until May 2007. Joplin, Missouri, suffered the deadliest U.S. tornado in almost six decades in May 2011. Two years later, almost half of its 7,500 students were still in temporary classrooms, but construction progressed on new schools thanks in part to voters approving the largest bond sale in city history. In August 2014, the strongest earthquake in 25 years hit Napa County, California, and traders exchanged a record amount of its debt in the following days amid concern that it could halt payments because of the damage. The list goes on.