For the last 25 years, scientists have been able to monitor the "greenness" of trees from space and use that as a tool for evaluating plant health. The problem is that greenness isn't a good indicator for stresses—such as drought—because some trees (think pines) continue to be a lovely green until they're dead. Researchers are thus turning to a new indictor: The way plants glow .
from Gizmodo http://ift.tt/1sfUzu0
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