What's so environment-friendly about asking businesses to buy 1,000 plastic bags that are about big enough to pack a lunch in? Keep America Beautiful Inc. of Amsterdam, N.Y., says these are litterbags that will help keep trash off the streets ("every car needs one"). The bags sport slogans such as "Reduce, Reuse, Recycle." The $140 price covers adding a message such as "compliments of Arrow Solid Waste Management." "Your image as a ... caring part of your community can only be enhanced," says a promoti onal letter. The plastic is 10 percent recycled.