4
QuizMultiple Choice

Human Impact on the Environment

Question 4 • Grade 8 World Cultures and Geography A

According to the majority of scientists, which of the following occurrences is most responsible for recent increases in global temperatures?

Answer
A
volcanic and earthquake activity
B
an increase in radiation released by the Sun
C
changes in the Earth's orbit
D
an increase in greenhouse gases in the atmosphere

Explanation

Most scientists attribute recent global warming primarily to the increase in greenhouse gases, especially carbon dioxide, released by human activities such as burning fossil fuels. These gases trap heat in the atmosphere. Volcanic activity, changes in solar radiation, and changes in Earth's orbit do not explain the recent rapid rise in global temperatures as well.

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