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Old 03-15-2013, 12:00 AM   #590 (permalink)
NeilBlanchard
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A little more carbon dioxide is fine, but a lot more is not fine. The tropic zone has been expanded by about 2 degrees latitude (in both directions) and higher temps and drought have strongly negative effects once a threshold has been passed. Different plants have different thresholds.

Planting zones have moved northward. Plants can't migrate, and even if they could, the soil conditions and the pollinators would not be there.
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