World leaders are gathering for meetings this week at the United Nations General Assembly in New York. Among the topics they’ll discuss is the ravages of climate change. This year, climate damage across the U.S. included devastating flooding, and while some people know they face flood risk, many do not. That’s largely because the official federal flood maps are often outdated and may not account for the effects of increasingly powerful storms. We wanted to know how technology is advancing the mapping effort. Marketplace's Jed Kim speaks with Michael Grimm, assistant administrator for risk management at FEMA, who manages flood mapping. Grimm says the agency continuously updates its tech, like lidar.