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11 Cards in this Set

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How do humans alter the Global Carbon cycle?
Burning of fossil fuels and the clearing of forests (increases the input of CO2).
How has the amount of methane doubled?
Its major sources are ruminant animals, microbial decomposition in swamps, marshes, and tundra, and industrial gases released to the atmosphere combined with the rise of human population, cattle ranching, and rice paddy production has double the amount of methane.
How has the rising levels of atmospheric CO2 and methane altered the atmosphere?
Altered the global energy balance and subsequently the global climate system (global warming).
What are the major human sources of nitrogen?
Agriculture, industry, and automobiles.
What factors have caused an increase in nitrogen production?
Conversion of natural grasslands into grain fields has caused a steady decline in the nitrogen content of the soil. Breaking up and mixing of the soil increases the rate of decomposition of deep organic matter, releasing nitrates and nitrous oxides.
What is the first response to increasesd availability of nitrogen in a nitrogen-limited ecosystem?
Increased growth.
The sulfur dioxide gas and nitrogen oxides mix in the atmosphere and fall to earth in what two forms?
Dry and wet deposition.
Wet deposition is more commonly known as?
Acid rain.
What is the ozone?
An ambivalent atmospheric gas that protects the Earth from harmful biological ultra-violet radiation.
How do humans affect the ozone?
By introducing chloroflourocarbons, methane, and nitrous oxide.
Where do CFCs come from?
Aerosol spray propellants, refrigerants, solvents, and other sources.