COVER: Man- made chemicals may be hastening shifts in the earth' s climate
A remarkable scientific expedition takes the measure of the Antarctic ozone hole and spurs concern that life on earth may become increasingly vulnerable to cancer- causing ultraviolet radiation. Disturbing evidence is mounting that emissions of carbon dioxide and other gases are heating up the world' s climate at a rate unseen since the end of the ice age. See ENVIRONMENT.
NATION: Gulf tensions rise as the U. S. and Iran clash again in a shootout at sea
American choppers sink one gunboat and disable two others...