an increase in the length of a day a decrease in the number of volcanic eruptions a decrease in the magnitude of large earthquakes an increase in the amount of atmospheric carbon dioxide
I gave my students this multiple choice question: Human activity most likely contributes to which of the following changes on Earth?

Only one answer is correct among these 4 choices:
- an increase in the length of a day
- a decrease in the number of volcanic eruptions
- a decrease in the magnitude of large earthquakes
- an increase in the amount of atmospheric carbon dioxide

Could you tell me which one is correct?

an increase in the amount of atmospheric carbon dioxide