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Global Warming Cerification Guide: Certification Test 34

Carbon Dioxide and Carbon Cycle MCQs App & e-Book: MCQ 34

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MCQ: 34

The concentration of Carbon dioxide has increased; from

  1. 300 ppm to 370 ppm
  2. 280 ppm to 370 ppm
  3. 200 ppm to 370 ppm
  4. 380 ppm to 370 ppm
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