And so concludes part three of NBC's five-part salute to pollution, an in-depth study of environmental pollution starring Glen Campbell, Frank Sinatra, the Supremes, the Smothers Brothers, and M.C.'d by Red Skelton. Next week..." I snapped off the set and yawned as a thought crossed my mind. My God, it sure gets you tired trying to keep up with each major crisis. I remembered the good old days of Ban the Bomb with a faint tinge of mauve nostalgia. Ah, the simple problems of yore. I wonder what the Ban the Bombers are doing now? Probably raising kids and fighting crabgrass. Oh, well...