Page 22 Advertisements Column 2

Press, 23 November 1988, Page 22

Understanding the greenhouse effect The greenhouse effect is caused by carbon dioxide and water vapor in the atmosphere preventing heat from the Earth’s surface from escaping. There are now higher levels of carbon dioxide in the atmosphere because more fossils fuels are being burned and huge portions of CO 2 -absorbing tropical forests are being destroyed. The extra carbon dioxide is forming a layer in the atmosphere like glass in a greenhouse — allowing in radiation from the sun, but not allowing heat from the Earth's surface to escape. The increased heat causes more water to evaporate, which in turns cause more water vapor in the atmosphere, further preventing heat from escaping. THEGREENHOUSEETOCT^^^^^ I^^^ I *^^^ 11 g r iwwSll Hl iSiilll il«l B k Higher Reduced Higher ocean Many water ||| average crop yields levels from supply ||||| temperatures in drought melted polar systems |w worldwide areas ice fields over-extended ||| i lisfcMNl■ Wr , ij , B iBIIP Increased W® ■I • M j^B^ : i^fti CVapora^on |H : IWB n Trapped A | heat Smaller forest acreage absorbs less CO,: ■ A J|||||| SOURCE: Environmental Protection Agency InfoGrapNc. © 1983 North America Syndicate. Inc.

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