How are carbon dioxide and other trace gases thought to be potentially related to global warming? Are the levels of these gases in our atmosphere increasing or decreasing and why are levels changing? Finally, what are some of the observed climatic
trends and possible consequences associated with global warming?
Carbon dioxide and other trace gases are thought to be potentially related to global warming because they are responsible for the greenhouse effect in the atmosphere. These gases absorb heat, so it is logical that increasing their presence in the atmosphere would also increase the greenhouse effect of the atmosphere. Levels of these gases are increasing due to the combustion of fossil fuels, deforestation, and ever-increasing industrialization. Some of the possible consequences of increased warming include sea-level rise, melting of arctic sea ice, melting of permafrost, local changes to the hydrologic cycle, and other "surprises" that cannot be predicted.
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Lightning
A) never strikes twice at the same place. B) strikes anywhere conductivity can be established. C) never strikes water. D) always strikes cedar trees.
Which of the following does not tend to increase biodiversity in an ecosystem?
A) evolution B) diverse habitats C) extreme disturbance D) relatively constant environmental factors
Which statement most accurately describes the population control efforts in China?
A) There is minimal governmental financial support for birth control for all couples. B) Increasing child survival, elevated status and employment levels for women, and increased literacy in the general population has decreased fertility rates. C) A one-child policy enforced through taxation and penalties may have been too successful in controlling population growth. D) A one-child policy that requires all women to work and guarantees education for all has decreased fertility rates. E) Changing public attitudes about family size through communication, education, counseling, and contraceptives have reduced the population growth rates.
What was the process responsible for the creation of many of Michigan’s waterfalls in the Upper Peninsula?
A. Major differences in elevation between Lake Superior and Lake Michigan B. Weathering and erosion of less resistant Munising sandstone below layers of stronger resistant sandy dolostone C. Weathering and erosion of igneous basalt rock below layers of Hematite D. Evaporation of seawater resulting in rock salt formations