A、Because they pollute air. B、Because they are natural hazards. C、Because they are increasing in numbers. D、Because people don’t

There, Yale University professors agreed in a panel discussion to night that the automobile was what one of them called "Public Health Enemy No. 1" in this county. Besides polluting the air and conges ting the cities, automobiles could cause heart disease "because we don’t walk anywhere any more," said Dr. H. P. Richard Weiner man, professor of medicine and public health. Dr. Weinerman’s sharp indictment of the automobile came in a discussion of human environment on Yale Reports, a radio program broadcast by Station WTIC in Hartford, Connecticut. The program opened a three-part series on "Staying Alive". "For the first time in human history, the problem of man’s survival has to do with his control of man-made hazards," Dr. Weinerman said. "Before this, the problem had been the control of natured hazards."