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It is said that agriculture is the single largest contributor to Irish greenhouse gas emissions - Leaving Cert Agricultural Science - Question a - 2020
Question a
It is said that agriculture is the single largest contributor to Irish greenhouse gas emissions. (i) Use a labelled diagram to illustrate the carbon cycle. (ii) Wi... show full transcript
Worked Solution & Example Answer:It is said that agriculture is the single largest contributor to Irish greenhouse gas emissions - Leaving Cert Agricultural Science - Question a - 2020
Step 1
Use a labelled diagram to illustrate the carbon cycle.
Answer
The carbon cycle illustrates the process through which carbon is exchanged among the atmosphere, oceans, soil, plants, and animals.
- Atmospheric CO₂: Carbon dioxide exists in the air as a significant greenhouse gas.
- Photosynthesis: Plants take in CO₂ from the atmosphere and, through photosynthesis, convert it into carbohydrates, releasing oxygen.
- Respiration: Animals and plants respire, returning CO₂ to the atmosphere.
- Decomposition: When organisms die, decomposers break them down, releasing carbon back into the soil and atmosphere.
- Fossil Fuels: Burning fossil fuels releases stored carbon back into the atmosphere.
The diagram should include the following labels: CO₂ in air, plants, animals, and fossil fuels.
Step 2
With reference to the carbon cycle, suggest two ways in which the emissions from agriculture could be reduced to help meet Ireland's climate change targets.
Answer
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Reduction in National Cattle Herd: By decreasing the overall number of cattle, methane emissions, a potent greenhouse gas associated with livestock, would also be reduced.
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Implementation of Energy Crops: Growing energy crops can help sequester carbon, as these plants absorb CO₂ during their growth, effectively reducing the net emissions from agricultural practices.