As an example, it is predicted that one third of Florida will be submerged under the ocean by the year 2100. However I haven't heard of any plans in plans in place to slowly relocate the city of Miami to a safer place within the next 80 years. Likewise governments in other countries don't seem to be planning to relocate their coastal areas any time soon and are in fact investing significant amounts of money into developing these regions.
What's the reason behind this? Does no government seriously believe that climate change will end up submerging their cities?