Question

As scientists, politicians and concerned citizens recognize the threat of global warming to the ongoing climate change, reductions in greenhouse gas emissions become the forefront of the discussions. To reduce the presence and persistence of greenhouse gases in the atmosphere their sources must be fully understood. Natural and anthropogenic greenhouse gases can impact their presence in the atmosphere. Which of the options best matches the anthropogenic sources and the greenhouse gas accurately?

Answer 1

Methane- livestock farming and landfill decomposition

CFCs- refrigerants and propellants

Carbon dioxide- combustion of fossil fuels

Explanation:

Methane is released by anaerobic decomposition, which often occurs in landfills, and during the breakdown of cellulose, which occurs in the rumen (stomach) of some herbivores like cows. This increase in methane significantly contributes to greenhouse gas emissions. CFCs are entirely man-made, and are a chemical release as a byproduct of refrigerants, coolants, and propellants from items made prior to the 1990s.

Answer 2

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