Teen writers plant seeds of knowledge By Brandy Bledsoe, 17Environmental writers wanted: Must be in high school, write fairly well, and have a compassion for younger kids and the environment. Optimistic outlook a plus. Ana Correa, Lisa DeMaria and Melissa MacDonald are three Boston-area 18-year-olds who responded to an invitation to write for Greentimes, an environmental newspaper that complements the science curriculum of elementary and middle schools in