White Mars: "Mars' surface shows dramatic erosion channels that have conventionally been interpreted as the result of catastrophic outbursts of liquid water. Yet, everything we know about Mars argues that it is drier than the Earth, and all its water should be locked up as subsurface ice. At the present day, only isolated sunny slopes near the equator transiently warm to the melting point of ice at noon, and in the past the sun was cooler. In attempting to explain the flood channels as evidence of liquid water, planetary scientists have developed a host of concepts and models which are generally unworkable, often impossible, and collectively raise more problems than they solve. "