In preparation for an upcoming global climate conference, organizers develop climate science training materials for business executives. How should the training material compare anthropogenic and natural climate changes?
A.
Human-caused warming is occurring much faster than natural warming after the last ice age.
B.
Human-induced warming currently exhibits a nonlinear relationship with global CO2 levels, whereas natural warming shows a linear relationship.
C.
Human activities slowed water vapor feedback, whereas natural climate changes do not alter water vapor balance.
D.
Human activities caused temperature changes greater than any previous natural temperature changes.
For example, the warming over the past century (approximately 1°C in about a century) is around 16 times faster than the average rate of warming coming out of the last ice age (roughly 6°C in 10,000 years corresponds to an average warming of 0.06°C/ century).
The answers are poorly phrased. None of them is correct. On fig. 1.3b p. 6 of the curriculum we can see that the temperature changes periodically and the change between min and max can be up to 10 degrees. They would need to specify a reference point for the temperature change.
A is incorrect as there is no concept of natural warming in my opinion. Nor we have discussed natural warming in the scr book.
option D seems to be correct that human activities is causing more changes to temperature than natural temp changes.
Selected Answer A not D: Global average temperature difference between an ice age and an interglacial is 6°C.
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