Which of the following removes CO2 from the atmosphere?

What does the ozone layer protect living things from?

What physical symptoms are associated with a reduction of ozone in the upper atmosphere?

World leaders struggle to form a global policy concerning the release of greenhouse gases. What best describes the role science should play in forming public policy?

What is the most likely effect of the increase in carbon dioxide levels in the atmosphere?

Which substance is considered the main cause of the "ozone hole"?

Burning fossil fuels adds carbon dioxide to the atmosphere. If we continue to add carbon dioxide to the atmosphere at the current rate, how will this affect the carbon cycle?

In the carbon cycle, how does carbon enter living organisms?

Why is the use of fossil fuels decreasing slightly?

What is the major reason that nitrogen is so important for living things?

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