Public opinion polls consistently show that significant proportions of the American people don't believe the climate is warming due to human activities, don't think that there is evolution by natural selection, and aren't persuaded by the safety of vaccines.
民意调查一贯表明， 有相当一部分美国人 不相信气候正在变暖是由于人类活动， 不相信有自然选择的生物演化， 并且不相信疫苗的安全性。