Minnesota Public Radio slideshow:
Warm winter signals climate change
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Some experts worry we may be approaching a "tipping point" of global warming, beyond which we won't be able to return to our familiar climate. (MPR Photo/Stephanie Hemphill)

Some experts worry we may be approaching a "tipping point" of global warming, beyond which we won't be able to return to our familiar climate.

(MPR Photo/Stephanie Hemphill)
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