John D. Hamaker (1914–1994), was an American mechanical engineer, ecologist, agronomist and science writer in the fields of soil regeneration, rock dusting, mineral cycles, climate cycles and glaciology. == Biography == === Background === Hamaker was born in St.
John D. Hamaker (1914–1994), was an American mechanical engineer, ecologist, agronomist and science writer in the fields of soil regeneration, rock dusting, mineral cycles, climate cycles and glaciology. == Biography == === Background === Hamaker was born in St.
Source: Wikipedia "John D. Hamaker" · CC BY-SA 4.0
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