Which of the following statements related to climate variation is true?

Question

BlackTom AI · Accepted Answer

The question asks which statement related to climate variation is true. Unfortunately, the provided data lacks the full set of answer options, so a complete comparison across all choices cannot be performed. What we do have is the stated correct option: 'b. During ice ages, the carbon dioxide concentrations in the atmosphere were lower than during the past few millennia.'

To evaluate this, consider established paleoclimate evidence: ice core records show that atmospheric CO2 was substantially lower during the last glacial maximum (roughly 26,000 to 19,000 years ago) than in the pre-industrial era. Typical glacial CO2 concentrations were around 180–200 parts per million (ppm), whereas pre-industrial and early industrial era levels were about 280–290 ppm. In the more recent past few millennia leading up to industrialization, CO2 remained relatively stable but low, and then rose sharply with industrial activity. This pattern—lower CO2 during ice ages and higher CO2 during warmer interglacial periods—fits the claim stated in option b.

Now, trying to assess potential flaws in the other options is limited here since they are not provided. However, in general, common misconceptions about climate variation include assertions that CO2 changes do not lag temperature changes, or that CO2 is only a feedback rather than a driver of climate cycles, or that atmospheric CO2 fluctuations over glacial-interglacial cycles are negligible. In reality, CO2 is both a driver and a feedback in the climate system, and its concentrations varied in tandem with, and amplified, natural climate cycles driven by orbital ( Milankovitch) forcing.

In summary, the key factual point reflected in the stated option aligns with the well-supported understanding from paleoclimate records: ice ages corresponded with lower atmospheric CO2 than in the recent past few millennia. If the other options were available, one would compare each claim against the same paleoclimate evidence, checking for consistency with ice-core data, carbonate records, and known mechanisms linking CO2 to global temperatures.

Dashboard QUIZ Multiple choice questions - Part 2

Which of the following statements related to climate variation is true?

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