Topograph has an interesting post on the ubiquitous imagery of shrinking glaciers; while BLDGBLOG has a discussion of the Lower Manhattan National Park. From the second:

In 2057, massive flood-control structures protecting New York City from the rising seas required a redirecting of the Hudson and East Rivers northeast, into Long Island Sound. The resulting dams—the construction of which triggered small earthquakes throughout New England—allowed for the draining of the old riverbed south and east of Manhattan, revealing the unearthly geological circumstances on which this archipelagic metropolis sits.