The city's Office of Sustainability and the Environment (OSE) is updating the city's Climate Action Plan, which hasn't been revised since it was adopted in 2006. Importantly, the new plan will include guidelines for adapting to the climate change that scientists now believe is inevitable, with consequences like hotter summers, more flooding, summer droughts, windstorms, and sea level rise. At a city council presentation yesterday, OSE director Jill Simmons called the upcoming changes a "pretty hefty overhaul."
You can read up on some of the challenges the city will be facing in the next 100 years or so here. Or you can just look at this scary map, which shows the projected sea level around Seattle in 2100. Red represents areas with six inches of sea-level rise or more. Bye-bye, Harbor Island:
And just for fun, check out this graph projecting temperature increases out to 2100: