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Why is it commonly believed that carbon dioxide is responsible for global warming?

Carbon dioxide levels in the Earth’s atmosphere have been steadily decreasing.

Carbon dioxide has a longer average lifetime in the atmosphere.

The warming effect associated with carbon dioxide has remained unchanged.

Other greenhouse gases amplify the effect of carbon dioxide.

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Which statement explains why many scientists believe that carbon dioxide has likely contributed more to global warming than other greenhouse gases?

Carbon dioxide is emitted from fertilizers used in farming.

Other greenhouse gases trap more heat than carbon dioxide.

Carbon dioxide has increased as a result of increased human activities.

Carbon dioxide is emitted from commercial refrigeration.

In what type of climate do trees produce narrower rings?

cool and dry

warm and wet

cool and wet

warm and dry

How do scientists study pollen grains to help them understand climate change?

by analyzing and making inferences about them

by observing and listing facts about them

by studying and reading more about them

by writing hypothesis about them

What climate conditions occur during La Niña?

stronger prevailing winds and more hurricane activity

warmer Pacific waters and warmer winters

more hurricane activity and warmer Pacific waters

warmer winters and stronger prevailing winds

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