Buy organic; boycott Styrofoam; turn the water off while you soap your hands. What else can you do to make your life greener? Blue Crump from Cityspace Construction, an environmentally conscious general contracting firm that offers green alternatives and solar solutions, leads a monthly "green course" at Ellwood Thompson's Local Market. This month's focus is on "green kitchens," helping homeowners find manufacturers that make more environmentally friendly cabinetry and countertops. You can visit Blue Crump at www.richmondcityspace.com. The course at Ellwood Thompson's is from 2 to 3 p.m. April 29. Seats are free but limited, so call 359-7525, ext. 25, to reserve your spot.