Over a timescale of 20 million years there'll be Ice Ages when a significant portion of the planet is covered in ice, so I can see how that will affect albedo t

Over a timescale of 20 million years there'll be Ice Ages when a significant portion of the planet is covered in ice, so I can see how that will affect albedo then. As I understand it, the extent of cloud cover affecting the planet's albedo (and whether that offsets the warming from the greenhouse effect from water vapour) is still an open question in meteorology. I'm absolutely not an expert on any of this - I was genuinely asking the question out of interest.