Four Hundred Parts per Million; Environmental Monitoring  

Oleh:

[s.n]

Jenis: Article from Bulletin/Magazine
Dalam koleksi: The Economist (http://search.proquest.com/) vol. 407 no. 8835 (May 2013), page 14-16.
Topik: Scientists; Carbon Dioxide; Measurement Techniques; Research & Development--R&D; Environmental Protection

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Perpustakaan Pusat (Semanggi) Nomor Panggil: EE29 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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In 1956, Charles D. Keeling started to build instruments that could measure the proportion of carbon dioxide in the atmosphere, a scientific topic which, back then, was barely even a backwater. In 1958, he installed some instruments high up on Mauna Loa, a Hawaiian volcano. He continued his measurements, at Mauna Loa and elsewhere, for almost 50 years. Throughout that time the annually wobbling level rose, and the rate at which it was rising increased. The serrated sweep of the Keeling curve became an icon of climate-change science. And this week or next, eight years after Keeling's death there will be a day when that curve breaks the 400ppm barrier for the first time. Like a birthday with a zero at the end of it, the 400ppm barrier has a psychological weight beyond any physiological significance.

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