In 2020, five major storms slammed the Louisiana coast, the most ever in a single season. For many living here, this unprecedented barrage was a final warning. Now Biloxi-Chitimacha-Choctaw tribal members have decided to leave. What happens here is an important foreshadowing of what will happen to coastal communities globally, researchers warn. Sea levels are rising by an average of about 3.5 millimeters (0.14 inch) per year. And the problem is getting worse.