Stories by Preston Cloud

The Biosphere

The totality of microbial, animal and plant lik on the earth not only is sustained by the lithosphere, the hydrosphere and the atmosphere but also has powerfully shaped their evolution

September 1, 1983 — Preston Cloud

Environment

The Oxygen Cycle

The oxygen in the atmosphere was originally put there by plants. Hence the early plants made possible the evolution of the higher plants and animals that require free oxygen for their metabolism...

September 1, 1970 — Aharon Gibor and Preston Cloud