Under current projections, the Atlantic would swallow much of the Florida Keys and Miami-Dade in a century, according to experts at a sea-level rise summit. The subject of global warming has become so politically unpalatable over the last few years that neither party mentions it much anymore. A conference on climate change sponsored by Florida Atlantic University made it clear that ignoring the threat has done nothing to slow it down — particularly in South Florida, which has more people and property at risk by rising sea levels than any place in the country. The two-day summit in Boca Raton, which wrapped up Friday, painted a bleak and water-logged picture for much of coastal Florida. Under current projections, the Atlantic Ocean would swallow much of the Florida Keys in 100 years. Miami-Dade, in turn, would eventually replace them as a chain of islands on the highest parts of the coastal limestone ridge, bordered by the ocean on one side and an Everglades turned into a salt water bay on the other.