What The Science Says:
Pluto's climate change over the last 14 years is likely a seasonal event. Pluto experiences drastic season changes due to an elliptical orbit (that takes 250 Earth years). Any Plutonian warming cannot be caused by solar variations as the sun has showed little to no long term trend over the past 50 years and sunlight at Pluto is 900 times weaker than it is at the Earth.
Climate Myth: Pluto is warming
"Some people think that our planet is suffering from a fever. Now scientists are telling us that Mars is experiencing its own planetary warming: Martian warming. It seems scientists have noticed recently that quite a few planets in our solar system seem to be heating up a bit, including Pluto." (Fred Thompson)
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