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Dr Pieter Tans

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Published on May 10, 2013

https://www.youtube.com/watch?v=NO5xZ... (still processing)
Dr. Pieter Tans, senior scientist, Global Monitoring Division of NOAA's Earth System Research Laboratory in Boulder.
Dr. Tans discusses the recent 400 ppm measurement of CO2 at Mauna Loa, and what it means.

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