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  1. What Is Climate Change? - Science@NASA

  2. What Is Climate Change? | Facts – Climate Change: Vital Signs of …

  3. What Is Climate Change? | United Nations - الأمم المتحدة

  4. What is climate change, and how is it affecting Earth? - Live Science

  5. What Is Climate Change? - NASA Climate Kids

  6. Climate change - Wikipedia

  7. What is climate change? A really simple guide - BBC News

  8. Global warming | Definition, Causes, Effects, Solutions, & Facts ...

  9. What Is Climate Change? - NRDC

  10. Basics of Climate Change - US EPA