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Question 22: Which of the following best summarises paragraph 2? A. Ecologists' surprise in the 1960s at net carbon uptake indicated decompo...

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Question 22: Which of the following best summarises paragraph 2?

A. Ecologists' surprise in the 1960s at net carbon uptake indicated decomposition was less efficient than thought, explaining how land sinks could effectively moderate atmospheric CO2 levels from human industrial activity.

B. The 1960s discovery of a carbon sink revealed a helpful planetary function, a natural ‘gift’ overlooked by early ecological models but essential in slowing the rate of global warming caused by decades of human CO2 emissions.

C. Defying older equilibrium models, the 1960s carbon sink finding showed growth exceeded decay rates, forming a key climate buffer that historically absorbed a large fraction of yearly human CO2 output from fossil fuel burning.

D. The unexpected finding in the 1960s that land systems take up net carbon, defying equilibrium theories, showed a crucial natural service that has substantially curbed yearly human CO2 impacts by acting as a buffer.

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