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The rate at which hydrogen is supplied to the Earth by the solar wind, and the rate at which hydrogen escapes from the Earth by diffusion into space are compared 011 the basis of recent estimates. It is found that the hydrogen supplied by the solar wind is roughly comparable to or may even be larger than present hydrogen losses. The Earth may have lost most of its hydrogen at an early stage when, according to Urey and Miller (1959), Pox (1960) and others, the Earth had a reducing, instead of an oxidizing atmosphere. However, no sufficient evidence is yet available to determine whether the Earth is still losing more hydrogen than it receives. The common notion that the Earth is still in the process of losing its hydrogen is therefore in question

A noie on the loss of hydrogen and the supply of hydrogen to the Earth as a direct or indirect effect of the solar wind