全世界每年燃烧化石燃料50亿吨,燃烧产生的二氧化碳约有一半停留在大气中。二氧化碳引起的“温室效应”使大气增温,从而导致极区冰融化,使海面水位升高。据一些科学家预测:地球表面的平均温度在今后50年内将上升1.5—4.5℃,海平面上升少则25厘米,多则1.2米,这样沿海低海拔的大片土地和许多沿海域市将被海水淹没,这对人类来说将是一场灾难。科学家们呼吁, About 5 billion tons of fossil fuel are burned in the world each year, and about half of the carbon dioxide produced by combustion stays in the atmosphere. The “greenhouse effect” caused by carbon dioxide causes the atmosphere to warm, resulting in the melting of ice in the polar regions and the rising sea level. According to some scientists, the average temperature on Earth’s surface will rise by 1.5-4.5 ℃ in the next 50 years, the sea level will rise by as little as 25 centimeters and as much as 1.2 meters, so large coastal land and many coastal cities will be submerged by seawater This will be a catastrophe for humans. Scientists call for