National Geographic : 1973 Nov
It's a bitter irony that at a time when Americans enjoy unprecedented prosperity, we seem to be running out of everything from gasoline to clean air. Most people concede that internal combustion engines are a major cause of air pollution. They also know that the sheer number of them hasalottodowithour fuel shortage. What may surprise you is that diesel engines have been and can continue helping us solve both problems. For one thing, diesel engines pollute far less than gasoline engines even without special emissions attachments. What's more, a diesel powered vehicle can travel much farther on a gallon of fuel than a similar gasoline powered machine. Also, diesel fuel is cheaper. Yes, diesel engines cost a little more to make. When improperly maintained they smoke under load. And some people complain of odor and noise. But those objections are being overcome. The environmental benefits diesels offer are too important to pass up. Diesel engines are not a cure-all for the fuel shortage and dirty air. But it's good to know that where useful work is needed they do it well and with minimum harmful side effects. For more information write: Diesel, Dept. 3081 G, Caterpillar Tractor Co., Peoria, Illinois 61602. There are no simple solutions. Only intelligent choices. CaterpillarCATERPILLAR Caterpillar, Catand0 areTrademarks ofCaterpillar Tractor Co.