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Which of the following regions is most likely to show a reduction in CO₂ absorption capacity during strong El Niño years, as highlighted by WMO reports?

1. Amazon Basin


2. Central Pacific Ocean


3. Siberian Taiga


4. Congo Rainforest
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With reference to atmospheric carbon dioxide (CO₂) dynamics, which of the following statements are correct?

1. In 2024, the global average CO₂ concentration rose by about 3.5 ppm over the previous year — the highest single-year increase since systematic records began.


2. About 50 % of anthropogenic CO₂ emissions are absorbed by natural sinks (oceans, forests, soils), but their capacity is declining under climate stress.


3. CO₂ is a short-lived greenhouse gas in the atmosphere, with an average lifetime of a few years, hence its effect diminishes quickly.


4. Increased wildfires, such as in the Amazon, contribute to net positive CO₂ addition due to both combustion and reduced uptake by stressed vegetation.
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Which of the above statements are correct?
Anonymous Quiz
41%
1, 2, and 4 only
20%
1 and 3 only
21%
2, 3, and 4 only
19%
1, 2, 3, and 4
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