re: You bet I like it.
It does sort of make sense:
There is gaseous CO2 on Mars. There is solid CO2 on Mars. CO2 phase changes are happening all the time on Mars. It is not reasonable to assume that all solid CO2 exists only as 100% pure dry ice sitting on flat, impervious surfaces, not on a planet with dust storms, sand dunes, and landslides!
Ergo, one ought to expect some manifestations of sublimating CO2 affecting surface materials (or even precipating dry ice doing so -- maybe adding enough mass to disturb a steep dune face).
Makes sense, but I know I didn't really give CO2 much thought until a few years ago. Nick gets much of the credit for that -- thanks!