WGRAPH 12 IiIPLICATION OF PREDICTED GREENHOUSE EFFECT t. PERMANENT SIIIOW COVER A]IID FLOATING SEA ICE W|LL BE REDUCED A. Negligible Effect On Sea Level II. PROBABLY NO EFFECT ON POLAR ICE SHEETS A. West Antarctic lce Sheet Most Critical III. LENGTH OF GROWING SEASOI{ WOULD INCREASE A. l"C Temperature Rise Adds 1O Days IV. CHANGES IN PRECIPITATION PATTERNS WILL BENEFIT SOIIE AREAS AND HARM OTHERS. A. Models Can Not Predict These Effects B. Can Study Evidence From Climatic Optimum 4000-8000 Years Ago.