Advocated preservation of wild places for their inherent beauty and for the sake of the creatures that live there.

John Muir advocated preservation of wild places for their inherent beauty and for the sake of the creatures that live there.
John Muir (also known as John of the mountains) was a Scottish-American naturalist and environmental philosopher. His work focused on advocating the conservation of the American wilderness. He co-founded the Sierra Club, which is a nature preservation organization. His work influenced the creation of Yosemite National Park.

It describes the rate at which plants and other photosynthetic organisms produce organic compounds in an ecosystem.

Sources are  carbon emitters

sinks are carbon absorbers

The movement of any material from one place to another is called a flux

Egestion: The act of excreting unusable or undigested material from a cell

Explanation:

fluxes are flows of carbon between sources and sinks. A source may also be a sink.