EEB428H1 Chapter Notes - Chapter N/A: Primary Production, Biogeochemistry, Climate Change

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Beyond global warming: ecology and global change summary. Well-documented global changes are increasing concentrations of co2 in the atmosphere, alterations in the biogeochemistry of the global nitrogen cycle, and ongoing land use/land cover change. Co2 increases are human caused and likely to have direct effects on all of earth"s terrestrial ecosystems. More nitrogen is fixed by humanity than by all natural pathways combined. Leads to altered chemistry in the atmosphere and aquatic environments, contributes to eutrophication of the biosphere, and affects biological diversity. Changing the land use has profound impacts on biodiversity. Human-caused global environment change is driven by our ever-growing numbers and resource consumption. Focus of this paper is on increasing concentrations of co2 in the atmosphere, alterations in the biogeochemistry of the global nitrogen cycle, and ongoing land use/land cover change. Co2 levels have been measured carefully since 1957, so we have a lot of accurate data telling us the levels are rising.

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