Maybe I should explain why I posted this link... it's because of the beauty of the thought: imagine a world where the sun is dimmer than ours, where the day temperature is only a little above freezing. Imagine that the skies are blue... which is exactly the problem because the heat escapes quickly. Freezing nights, which create violent snow storms, very long glaciers, and an ocean covered by many meters thick layers of ice. In other words, a mixture of Mars and Europa (the moon).
Imagine periodic violent volcanic eruptions, which spew tons of ashes and greenhous gasses into the atmosphere. A dead soil, chemically in balance with the atmosphere because there is hardly any erosion, means that they are not absorbed back. They stay there, and over eons become a fuzzy haze which covers the globe.
The heat is trapped, the ice melts, and a long hot summer begins... one which will last for thousands and thousands of years...
Okay, that's just my imagination
