Proving climate change: The Keeling curve
Witness History - En podkast av BBC World Service
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How a young American scientist began the work that would show how our climate is changing. His name was Charles Keeling and he meticulously recorded levels of CO2 in the atmosphere. His wife Louise and son Ralph spoke to Louise Hidalgo about him in 2013. (Photo: Thick black smoke blowing out of an industrial chimney. Credit: John Giles/PA)
