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Royal Institution Christmas Lectures 2020: Planet Earth - A User's Guide Clips

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  1. Why the CO2 we breathe out isn't bad for the environmentUp in the Air

    Duration: 02:02

  2. How salty is the ocean - and why?Water World

    Duration: 02:23

  3. Earth's 4.5 billion history in 100 metresEngine Earth

    Duration: 03:00

  4. Climate and Weather: What's the difference?Engine Earth

    Duration: 01:41