Global warming puts another notch in its belt: unusually early fall color in Pennsylvania.
A friend called from the Rocky Mountains earlier this week, reporting that the hummingbirds are coming through much earlier than usual. I've learned my lesson, though. I made no attempt to link the phenomenon with the curiously persistent belief that temperatures are rising. She'll see the pattern on her own some day, or she won't. If I try to get her to think about it, she'll only get defensive. And of course I can't be sure, either, whether the current cooling is noise in the signal or a reliable indicator of long-term trends. The difference is that I'm aware there's room for doubt, and have at least attempted to look into the reliability of the physical explanations for a projected warming.
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