What problem is raised in the article? 1. Cooperation in space. 2. Threats of climate change. 3. Danger of drinking salt water. 4. Lack of water supplies on Earth.

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What problem is raised in the article? 1.  Cooperation in space. 2.  Threats of climate change. 3.  Danger of drinking salt water. 4.  Lack of water supplies on Earth.

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