One sure fire way to out-green your neighbors would be to install a vegetated roof on your home.Your neighbors will just die when they see you putting a layer of soil and grass seeds over your house's roof. It will drive them even crazier when you show off the savings on your energy bill. After tonight's event presented by the Northwest Eco-Building Guild, you will be able to one-up all your neighbors in the ever escalating eco-arms race. What the program doesn't cover is how to get your flock of pygmy goats up there. (Phinney Neighborhood Center, Lower Brick Building, 6532 Phinney Ave N, 7 p.m., $10 donation)