This is interesting because both Mars and Pluto are also undergoing global warming.
Global Warming on Pluto Puzzles Scientists.
By Robert Roy Britt
Senior Science Writer
posted: 09 October 2002
01:25 p.m. ET
http://www.space.com/scienceastronomy/pluto_warming_021009.html
Mars Emerging from Ice Age, Data Suggest.
By SPACE.com
posted: 03:00 pm ET
08 December 2003
"Scientists have suspected in recent years that Mars might be undergoing some sort of global warming. New data points to the possibility it is emerging from an ice age."
http://www.space.com/scienceastronomy/mars_ice-age_031208.html
Then perhaps the process causing the global warming on Earth is to solar or even extra solar system phenomena.
Bob Clark