The West Antarctic Ice Sheet (WAIS) is melting! New science research show that rising sea levels could swallow up small islands! BBC story.
Now the details. The WAIS has been melting at a steady rate since the end of the last ice age, 10k years ago. If it continues at its present rate, it will all melt in 7k years, and raise ocean levels 16 feet. Meanwhile, I'd be more concerned about an ice age returning, as it has many times over the last 2M years.