5.4 Why are gloval temperatures changing?
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
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what is the atmosphere?
a thin layer of gases extending 100km above the Earth’s surface
what is the greenhouse effect?
the energy radiated from the earth’s surface is absorbed by gases in the atmosphere which warms it. these gases stop the infrared radiation from escaping
what is global warming?
the gradual increase in the earth’s temperature generally due to the greenhouse effect cause by the increase of greenhouse gases trapped within the atmosphere
what does the term global warming potential mean?
the measure of the greenhouse effect caused by the gas relative to the same amount of carbon dioxide over a given time
why does CO2 have the largest effect?
it has the longest average lifetime in the troposphere
what four processes produce methane?
anaerobic decay of organic matter in waterlogged conditions, decay of waste, cattle and incomplete combustion of fossil fuels
what is the effect of methane compared with the effect of carbon dioxide?
a molecule of methane absorbs more infrared radiation than a molecule of carbon dioxide but it does not stay in the atmosphere for as long as carbon dioxide
how could methane emissions be reduced?
through cattle waste recycling and using it as biofuel
in science, what does the term theory mean?
implies a well-tested and widely accepted idea or principle supported by a great deal of evidence
in science, what does the term controversial mean?
alternative points of view about it can be reasonably held
why is global warming a controversial issue?
science can’t prove theories, they can only disprove them. there’s incomplete knowledge of how the climate systems work and data sets