单选题
Not too long ago, if you bought a bottle of cola you paid a few cents deposit on the bottle, and the only way to redeem that extra cost was to return the empty bottle to the store. Bottles were still expensive enough to make it worth the cola-bottler's trouble to keep collecting the empties, sterilizing them, and refilling them over and over again. But then the glass makers learned how to mold bottles of cheap glass that cost a cola-bottler less than it cost to pay for collecting and reusing the old-style bottles. So the "one-way, no-deposit, no return" bottles came into use. They were never free; the price of the cola went up a trifle to cover their cost to the cola-bottler. But the cola-drinkers gladly paid the bit extra to be saved that old chore of saving and returning empty bottles. One result was that the profit-motivated cola-bottler made more money. Another result was that the laziness-motivated cola-drinkers was put to less bother. But the third result was that the world's landscape now glitters—and not prettily—with an incredible number of thrown-away bottles. Would you believe trillions? In the United States alone, in a single year, soda and beer drinkers casually, carelessly toss away twenty-eight billion nonrefundable bottles, and this has been going on for years.