Among the activities listed, the ones that release greenhouse gases into Earth's atmosphere are:
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Catching fish: While this activity itself may not directly release significant greenhouse gases, the processes associated with fishing (such as the operation of fishing boats and processing) can contribute to emissions.
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Raising livestock: This is a major source of greenhouse gases, particularly methane and nitrous oxide, which are released during digestion, waste breakdown, and manure management.
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Growing flowers: This activity typically has a lower direct impact on greenhouse gas emissions, but it can involve practices (like the use of fertilizers and transportation) that may result in some emissions.
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Planting forests: This activity generally helps to sequester carbon dioxide from the atmosphere rather than release it, making it a positive action against greenhouse gas emissions.
In summary, raising livestock is the most significant source of greenhouse gases from the activities listed.