冷気の本質
アメリカの食料品店の前にある不思議な空間には、ドライアイスが置かれている。1925年に商業化されたドライアイスは、冷蔵輸送の革命をもたらし、ニューメキシコ州のブエイロス油田から採掘された純度99%のCO2が原料となった。現在では、CO2は石油増進回収（EOR）に使用され、炭素回収・貯留（CCS）技術の一部として気候変動対策に利用されているが、その実効性には疑問が残る。
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