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There are plenty of ideas, but few clear facts
In 1929 English biologist J.B.S. Haldane published a paper in which he proposed that ultraviolet light, acting on a primitive atmosphere containing water, ammonia and methane produced oceans with the consistency of a "hot dilute soup" containing the building blocks of life. In the nineteenth century Ernst Haeckel argued that although spontaneous generation was not observable under the current conditions on earth, it did take place in the past under different chemical conditions. Oparin and Haldane made the first serious proposals regarding those conditions.
The atmospheric conditions proposed by Oparin, Haldane and Urey were radically different from what exists today. Because oxygen destroys the chemical building blocks of life, they speculated that the early earth had an oxygen-free atmosphere. However, in the last few decades, evidence has surfaced that has convinced most atmospheric scientists that the early atmosphere contained abundant oxygen.
Primordial Soup Theory - Crystalinks
Many theories on origin of life at the end of the XIXth century and the beginning of the XXth, generally use conceptions of life instead of explicit definitions of life. This paper presents ideas on the origin of life as studied by Buffon (1707–1788), Lamarck (1744–1829), Darwin (1809–1882), Huxley (1825–1895), Oparin (1894–1980) and Haldane (1892–1964). We show that their conceptions on the evolution of matter and life reveal their conceptions of life rather than their definitions of life.
Chemical evolution and the origin of life: Current ideas about theorigin of life are based on the Oparin-Haldane theory of chemicalevolution, in which life arose gradually in a reducing atmosphere.
The Origin of Life and the Suppression of Truth
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