Here are paraphrases of the passages without looking back at the original text:
1. Jacques Cousteau explained that the Antarctic plays an important role in regulating the Earth's climate. Cold water from Antarctica circulates and mixes with warmer tropical waters, helping to cool both surface waters and the atmosphere. However, this fragile system is now threatened by human activities.
2. Prohibition was in effect in the 1920s, but alcohol was still widely available in local bars. Organized crime dominated cities while police struggled to enforce the law. Jazz music became popular among young people, replacing classical music. The flapper emerged as a symbol of changing social norms for women with her short skirts and bobbed hair.
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