The trapping of heat in the lower atmosphere (the troposphere), referred to as t
ID: 295297 • Letter: T
Question
The trapping of heat in the lower atmosphere (the troposphere), referred to as the greenhouse effect, is a natural process that helps regulate the temperature of our planet, allowing for life on Earth to exist and flourish. Nitrogen and oxygen molecules make up 99% of Earth's atmosphere, with water and carbon dioxide accounting for less than 0.5%. This natural greenhouse effect is the result of heat absorption by H2O and CO2 molecules in the lower atmosphere, and re-radiation of this trapped heat back to Earth's surface. Without the natural greenhouse effect, Earth's temperature would be 0°F instead of its present 57°F. The question for some is whether human activities are causing an increase of the greenhouse effect, and thus global climate change. Scientific data collected in the past fifty years indicates that the concentration of greenhouse gases in the atmosphere has been increasing and the greenhouse gas that has stabilized in the lower atmosphere is
CFC.
The greenhouse gas that has been the most directly connected to the combustion of fossil fuels is ________ and the greenhouse gas that has stabilized in the lower atmosphere is ________.
CO2; CFC
CH4; CFC
CO2; CH4
N2O; H2O
H2O; CH4
CO2; CFC
CH4; CFC
CO2; CH4
N2O; H2O
H2O; CH4
Explanation / Answer
The greenhouse gas that has been the most directly connected to the combustion of fossil fuels is 'CO2' and the greenhouse gas that has stabilized in the lower atmosphere is CFC. Greenhouse gas effect is causing global warming.
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