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

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

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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 worl…

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