Abstract
We argue that the present rate of escape of hydrogen from the upper atmosphere of Venus establishes an upper limit for the rate of degassing of water from the interior of the planet. This upper limit is 2.4×109 grams of water per year. If we assume that this value holds also for deep-mantle degassing from the earth, we find that the rate is insufficient, by five orders of magnitude, to supply the water at the earth's surface in 4.5×109 years. An early episode of greatly enhanced degassing appears to be required.
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