rPEeTTPtteTTIT 222222222222222 2222222 ? 222222222222222222222822222222228722222222227222? 2222222 ? Test Your Knowledge OfA Chemical Blessing (NAPSA)—Carbon dioxide is not onky a part of every breath you take—humansinhale oxygen and exhale CO:-—it also provides other surprising benefits to each of us. Take this little test to show how mach you know about this arias- ing chemical. 1. Animals inhale oxygen and exhale CO: Plants do (a) the same (b) the opposite (c) neither? 2. More CO: in the atmosphere wil probably mean (a) more (b) less (ec) the samme amount of plant growth? 3. Extra COs in the air encourages plants to use water (a) more (b} less (c) not at all efficiently? 4. Scientists say 9,000 years ago, agriculture sprung up all over the world. This corresponds with an (a) increase (b) decrease (ec) absence of COs in the atmosphere? 5. Some people believe CO: contributes to the earth’s climate becoming warmer. For the past plant yield,” says Dr. C. Too Campbell, professor of plant pathologyat North Carolina State University. 3. (a} “The arnount of water that’s used by plants to produce the sare amount of growth actually decreases with increased CO:,” says Dr. James Arthur Bunee, of ern plants evolved when COQ: was higher in the atmosphere than it is today,” adds Dr. Patrick J. Michaels, professor of environmen- the U.S. Department of Agriculture’s Climate Stress Laboratory. “This is important,” adds Dr. Wittwer, “because water is going to become probably the most limiting natural resource as far as food production is concerned.” 4. (a) Dr. Robert C. Balling, Director of the Office of Climatology of Arizona State University says: “Agriculture sprung up all over the world when COz increased from about 200 parts per million to about 250 parts per mullion. It may be COh is the reason we domesticated plants.” 5. (c) repart the experts at the Greening Marth Society. The scientists, business people and others in this organization believe humankind is a part of nature and that industrial evolution is good. To learn more about the society, level to two times what we have today would basically increase you can call 800-529-4503. two decades, both satellite and halloon-borne instruments have found the global temperature change to be up, on average (a) 10 {bh} 1 (e} 0? Answers 1. (hb). Explains Sylvan H. Witt- wer, professor emeritus, herticul- ture, Michigan State University, “COb is a very important nutrient, perbaps the most unportant” for plants and the animals, including people, who eat plants. “Most mod- tal sciences at the University of Virginia. 2. (a) “Increasing the COb how te join and get fascinating books, tapes and reports, visit www.greeningearthsociety.org or
