There's a new bumper stickers that says: "Trees are the Answer." The idea is to make us all aware of how important planting trees is to the environment. But, commentator Andy Wasowski says that while the basic thought is right, the methods can be very wrong. Mr. Wasowski lives in northern New Mexico surrounded by native Ponderosa Pines. He is co-author of "Gardening with Native Plants of the South" and "Native Gardens of Dry Climates".