Rising seas threaten to consume the coastal areas of major cities around the world. Now, those risks are compounded by an accelerating danger: Most of those cities are also sinking. Southern Florida is one of the most vulnerable places. "My city is a barrier island, manmade, built on porous limestone sitting at sea level." said Miami Beach Mayor Dan Gelber in an interview with host Mike Walter. "So we had to actually start addressing it pretty quickly." #features #fullframe #fullframecgtn Watch CGTN LIVE on your computer, tablet or mobile http://america.cgtn.com/livenews Subscribe to CGTN America on YouTube Follow CGTN America: Twitter: @cgtnamerica Facebook: @cgtnamerica Instagram: @cgtnamerica TikTok: @cgtnamerica