Which of the following statements are correct about the deposits of ‘methane hydrate’? 1. Global warming might trigger the release of methane gas from these deposits. 2. Large deposits of ‘methane hydrate’ are found in Arctic Tundra and under the seafloor. 3. Methane in atmosphere oxidizes to carbon dioxide after a decade or two. Select the correct answer using the code given below:
Explanation
Statement 1 is correct: Global warming poses a significant threat to methane hydrate deposits. These icy structures, found in permafrost and deep-sea sediments, can destabilize as temperatures rise, releasing methane into the atmosphere. Since methane is a potent greenhouse gas its release could create a positive feedback loop, further accelerating global warming.
Statement 2 is correct: Large deposits of methane hydrate are primarily found in two locations: 1. Arctic Tundra: Permafrost soils in the Arctic hold significant methane hydrate reserves, which are at risk of melting due to rising temperatures. 2. Seafloor Deposits: Continental margins and deep ocean sediments contain vast methane hydrate reserves. Changes in ocean temperature and pressure fluctuations can trigger their release.
Statement 3 is correct: After about 12 years, the methane is converted into carbon dioxide through hydroxyl oxidation. While CO₂ is a less potent greenhouse gas than methane, its longer atmospheric lifetime means it continues contributing to long-term climate change.
Therefore, option (D) 1, 2 and 3 is correct.