The most vulnerable state in the nation is finally getting a billion-dollar boost to its plans to protect itself against the rising sea, the tip of the trillion-dollar iceberg of climate change expenses the state faces. On Tuesday, Gov. Ron Desantis announced funding foranother 113 projects that will install new stormwater pumps and drains in flood-prone cities, convert leaky septic tanks to sewer lines, elevate and floodproof critical buildings and restore wetlands over the next three years. It’s the largest amount of money for climate change preparation ever seen in Florida — and all $404 mi…