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Pollution, Climate and Conventions · Question 35 of 67

Question 35

HardOriginal question

Before the Industrial Revolution the air held about 280 parts per million (ppm) of carbon dioxide. Its level today is

Options for question 35

Show the answer and explanation
CorrectNot quiteAnswer B

Correct answer: B

Explanation

  1. Measurements at Mauna Loa in Hawaii and elsewhere show carbon dioxide passed 400 ppm in the 2010s and is still rising.

  2. That is roughly a 50% rise, mainly from burning fossil fuels.

Concept
Rising carbon dioxide
Typical time
90 s
Your time
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The rule this testsOzone layer and greenhouse effect
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