Several climate feedback loops helped to increase temperatures from the last gla

Question

Several climate feedback loops helped to increase temperatures from the last glacial 20,000 years ago to interglacial

conditions today. Which of the below is a NEGATIVE feedback loop rather than a positive feedback loop?

A. Warming temperatures and more rainfall globally at the end of the last glacial period caused increased growth of vegetation which would act to decrease

atmospheric carbon dioxide levels.

B. Warming of the oceans at the end of the last glacial period releases carbon dioxide to the atmosphere (because less carbon dioxide can dissolve in

warmer water).

C. Warming temperatures at the end of the last glacial period resulted in thawing of permafrost over large areas which released carbon dioxide to the

atmosphere.

D. Warming temperatures at the end of the last glacial period caused a reduction in ice covered areas (sea ice, ice sheets and snow) which decreased the

Earth's albedo.

Explanation / Answer

Answer:

[A]. Warming temperatures and more rainfall globally at the end of the last glacial period caused increased growth of vegetation which would act to decrease atmospheric carbon dioxide levels.

Hence,Option (a) is the correct answer.

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