Evaluation The most inclusive evaluative statements made are found in Refer- ences 22 and 24. . No statistically significant changes in the weather during the first ten years of the atomic age have been found, yet careful physical analysis of the effects of nuclear explosions on the atmosphere must be made if we are to obtain a definite evaluation of this problem. Although it is not possible to prove that nuclear explosions have or have not influenced the weather, it is believed that such an effect is unlikely . . ." (1956) " - although there has been much speculation about the influence of atomic testing on weather, there still appears to be no additional evidence suggesting a cause and effect relation- ship . . ." (1960) 35.