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Googling Paul E. Geisler produced this:
http://www.lpi.usra.edu/meetings/lpsc2007/pdf/2190.pdf
The article talks about specific regions of the planet and various reasons for changing albedo. The winds are variable and more or less circumferential, and there is no mention of darkening the poles due to dust. There is mention of polar darkening due to some melting/sublimating of CO2 ice.
In other words, the warming of Mars argument seems to be no more reason to deny anthropogenic global warming than is the old saw about global cooling in the 1970s.
Fred Bortz
Science and technology books for young readers (www.fredbortz.com)
and Science book reviews (www.scienceshelf.com)