Which one of the following has a net negative forcing effect on global climate?

Name: Which one of the following has a net negative forcing effect on global climate?
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Question

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Sulfate aerosols have a net negative forcing effect on global climate. They reflect incoming solar radiation back into space, which cools the Earth's surface. Carbon dioxide, methane, and water vapor all have a net positive forcing effect on global climate, as they trap heat in the atmosphere and contribute to the greenhouse effect.

Which One of the Following Has a Net Negative Forcing