GEOL 101 Lecture Notes - Lecture 6: Water Vapor, Overgrazing, Smog
23 Dec 2015
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Reading notes: 19. 6 human impact on the earth system. Humanity is a major agent of global change; the pace of earth"s. Population grows & standard of living improves per capita usage of. 20,000 people lived on earth after eruption of volcano. By 4000 bce, a few tens of millions. Beginning of 19th century- better industrial methods, agriculture, (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) medicine, hygiene = raised living standards and lowered death rate 1850: Humans began effecting the ecosystem in the stone age. Slash-and-burn agriculture hurt the forests, overgrazing by domestic. Ecosystem: an interconnected network of organisms and the physical. Greenhouse gases play a major role in the regulation of the earth"s. Human populations grew urbanization, industrial and agricultural. Examples: smog, water contamination, acid runoff, acid rain, Atmosphere was governed by natural processes (volcanic eruptions, life evolution events, forest fires, organic uplift and weathering, warming and cooling) but then human society began to change the environment (cid:1)
