By Donald F. Boesch, The Baltimore Sun

We know that the average water temperature of the Chesapeake Bay has increased by nearly 2 degrees Fahrenheit since 1960. If global warming continues unabated, it is likely to rise by an additional 5 or more degrees by the end of this century.

We know that the bay's sea level has risen by a foot and a half since the 1930s. Climate science tells us that we should prepare for an additional 2 feet to 4 feet before the next century.

We know that over the last four centuries, the bay has lost about 10 inhabited islands to erosion and a rising sea level.

Each of these facts is troubling on its own. Examined as a whole, they confirm that global climate change has already arrived in the Chesapeake Bay region.

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