OBS! The link to this article has been changed for some reason. --- My comment (the line above) didn't show up when clicking on "comments". After clicking edit/save without changing anything it reappeared. I have now added this (after the "---" to the original comment)
- Mogens Michaelsen
[1110.4525] Suppression of the water ice and snow albedo feedback on planets orbiting red dwarf stars and the subsequent widening of the habitable zone - http://arxiv.org/abs/1110.4525