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Scientists determined the historic levels of carbon dioxide in the Earth’s atmosphere by _____. 1. testing air bubbles in Antarctic ice 2. testing soil samples all over the world 3. evaluating tree ring
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Scientists determined the historic levels of carbon dioxide in the Earth’s atmosphere by _____.

1. testing air bubbles in Antarctic ice

2. testing soil samples all over the world

3. evaluating tree ring growth

4. mapping the growth of redwood trees

User Jon Sakas
by
8.1k points

1 Answer

1 vote
I would say choice one, testing air bubbles in antarctic ice. 
User Everaldo Aguiar
by
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