[30-5] CO2 Spiral / 二氧化碳排放, 2005
Between 1950 and 1986, annual carbon dioxide emissions have tripled. The principal source of these emissions is fossil fuel combustion, but natural gas flaring and cement production also contributes to the rising level. Carbon dioxide is the major cause of the Greenhouse Effect.
每年的二氧化碳排放量從1950年到1986年驟增了三倍之多。燃燒化石燃料佔排放總量的大部份，不過天然氣燃燒和水泥生產也是造成碳排放量提升的因素。二氧化碳則是造成溫室效應的主因 。
