Berry or Canary?

I like cranberries. But I admit they're topmost on my mind only once a year. And this year, thanks to a story in the Christian Science Monitor, as I slide a deep red serving next to my potatoes and stuffing, I'll know that even the berries have a message for us:

When Rod Serres thinks about cranberries, he doesn't see them beside a Thanksgiving turkey. Another bird comes to mind: a canary in a coal mine. That's because, like all berries, cranberries are very sensitive to climate, making them the agricultural harbinger of global warming in America's Northeast.

What will Massachusetts be like without cranberries? A lot less colorful, as this narrated slideshow demonstrates.