If at all possible, find a rainy day and head down to the Museum of Science for the new exhibit Double Exposure
. It is a side-by-side comparison of legendary wilderness photographer Brad Washburn's 1937 photos with similar photos taken today. Each image is by itself amazing from an artistic standpoint. The contrast between the two is a stark illustration of global warming's effects.
If you dare not brave packs of midmeltdown semiferal toddlers, some of the exhibit is available online at doubleexposure.net. But the low-res jpegs here are a poor substitute for the originals. And you'd be missing the awesome new lizards and snakes exhibit as well.