If sea levels rose less than an inch per decade last century, why should they rise over 6 inches per decade for the rest of this century?

Reporter’s Notes: Redesigning the Bay

The most recent estimate looks pretty dire. The Bay Conservation and Development Commission (BCDC), a state planning agency, says it expects San Francisco Bay to rise about 16 inches by 2050, and 55 inches by the end of the century.

Recent Climate Change - Sea Level Changes

...sea level has risen worldwide approximately 4.8-8.8 inches (12-22 cm) during the last century (IPCC, 2007).