control

In biology, the process by which a tissue, an organism, a population, or an ecosystem maintains itself in a balanced, stable state. Blood sugar must be kept at a stable level if the brain is to function properly, and this steady state is maintained by an interaction between the liver, the hormone insulin, and a detector system in the pancreas.

In the global ecosystem, the activities of the human race are endangering the balancing mechanisms associated with the atmosphere in general and the greenhouse effect in particular.