Here's a bit of the ammunition you'll need for a lively debate with slow food organizer Diane Campion at this Sunday's panel discussion "Why Buy Local?" Campion, heirloom tomato farmer Walt Ross, and Cafe Boulud Chef Zach Bell are hosting a seminar at the Boca Raton branch of Whole Foods from 1 to 2:30 p.m. on January 11th to explore the question of whether local food tastes better, helps the environment, or is somehow ethically superior to the stuff produced by Monsanto and Perdue (they thin