Within the context of historical meteorological data provided in many standard textbooks, 2010 is cited as one of the warmest years on record. This was due to a combination of long-term global warming trends and a strong El Niño event, which released significant heat from the Pacific Ocean into the atmosphere, breaking previous temperature records globally. ANSWER: (B) 2010
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2010 was a significant year in climate science as it tied with 2005 as the warmest year globally at that time. The year started with a strong El Niño phase, which naturally warms the planet. Even as El Niño transitioned into a cooling La Niña phase later in the year, the average global temperatures remained exceptionally high. This underscored the fact that greenhouse gas-driven warming was becoming the dominant force in global climate, as even “cooling” phases were now warmer than previous “heating” phases from earlier decades.
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