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Climate of the world is threatened by

1. Increasing concentration of atmospheric oxygen
2. Decreasing amount of atmospheric oxygen
3. Increasing amount of atmospheric carbon dioxide
4. Decreasing amount of atmospheric carbon dioxide

Correct answer: Increasing amount of atmospheric carbon dioxide

Solution

The increasing amount of atmospheric carbon dioxide is a major contributor to global warming and climate change, as it enhances the greenhouse effect by trapping heat in the Earth's atmosphere.

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