BIOL 2050 Lecture Notes - Lecture 25: Nitrogen Cycle, Acid Rain, Tectonic Uplift
4 Oct 2016
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Document Summary
Concept 25. 1 elements move among geologic, atmospheric, oceanic, and biological pools at a global scale. Concept 25. 2 earth is warming due to anthropogenic emissions of greenhouse gases. Concept 25. 3 anthropogenic emissions of sulfur and nitrogen cause acid deposition, alter soil chemistry, and affect the health of ecosystems. Concept 25. 4 losses of ozone in the stratosphere and increases in ozone in the troposphere each pose risks to organisms. Atmospheric emissions caused widespread environmental problems: pollutants, greenhouse gases, dust. A major focus of global ecology: study of environmental effects of human activities. Global cycling of carbon (c), nitrogen (n), phosphorus (p), and sulfur (s: emphasized because of their biological importance and their roles in human alteration of the global environment. Flux: rate of movement of an element between pools: moving around. Terrestrial plants are a pool of carbon; photosynthesis. Both are greenhouse gases that affect the global climate.
