Slow ZOOM IN on top of Dupont plant tower, smoke. Static of other part of plant, smoke in air, billowing flame. Cut to longer shot of flame, gas burn-off, pipe visible. ELS of flame, billowing smoke, plant chimney visible along left frame line. Very hazy LS of Monsanto chemical plant, stacks, traffic on expressway in lower foreground. Hazy MLS of stacks, smoke coming out. MS of outlet of chimney, great volumes of smoke pouring out. MLS of funnel, smoke spewing out. LS of smokestack of Sudbury Nickel mill, large plume of smoke. MLSs of tops of stacks, much smoke pouring out, waste land visible in foreground in some shots. Smoggy shot of paper mill between Calgary and the Rockies, stacks pouring great amounts of smoke into the air. MLSs of smoke stacks at Sydney Steel mill emitting heavy, reddish smoke.