A new negative feedback has been observed which opens a possibility for a
temperature adjustment and cooling by cloud cover height alteration. New
reasearch suggests the upper atmosphere is getting colder or drier to the
extent that the cloud tops now reach 1% lower than 10 years ago.
This is a novel negative forcing from greenhouse gas forcing that traps more
heat and moisture to the lower parts of the air column:
http://www.nasa.gov/topics/earth/features/misr20120221.html
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