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Vernadsky first popularized the concept of the [[noosphere]] and deepened the idea of the [[biosphere]] to the meaning largely recognized by today's scientific community. The word 'biosphere' was invented by [[Austria]]n [[geologist]] [[Eduard Suess]], whom Vernadsky met in 1911.
In Vernadsky's theory of the Earth's development, the [[noosphere]] is the third stage in the earth's development, after the [[geosphere]] (inanimate matter) and the [[biosphere]] (biological life). Just as the [[emergence]] of life fundamentally transformed the geosphere, the emergence of human [[cognition]] will fundamentally transform the biosphere. In this theory, the principles of both life and cognition are essential features of the Earth's [[evolution]], and must have been implicit in the earth all along. This systemic and geological analysis of living systems complements [[Charles Darwin]]'s theory of [[natural selection]],{{
Vernadsky's visionary pronouncements were not widely accepted in the West. However, he was one of the first scientists to recognize that the oxygen, nitrogen and carbon dioxide in the Earth's atmosphere result from biological processes. During the 1920s he published works arguing that living organisms could reshape the planets as surely as any physical force. Vernadsky was an important pioneer of the scientific bases for the environmental sciences.<ref>S.R. Weart, 2003, ''The Discovery of Global Warming,'' Cambridge, Harvard Press</ref>
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