QUESTION:
How is the weather on pluto effected when it's orbit brings it closer 
to the sun?

ANSWER from Peter Stockman on April 30, 1996:
I am not an expert in this area.  But I believe that the additional heat
from the sun (because Pluto comes closer to the sun) may melt some of the
ices on Pluto's surface.  Not only will this change Pluto's appearance
since the ices can be very reflective, it may appreciably increase the
amount of gas in Pluto's atmosphere -- causing stronger winds, perhaps some
precipitation or carbon dioxide snow.  It may also change the overall
"climate" if the atmosphere and surface begin to absorb even more sunlight.

Thus, this might be an opportunity to observe the kind of planet-wide
weather changes that many ecologists are concerned about on Earth: Pluto's
version of global warming.