He has said that "the concept of global warming was created by and for the Chinese in order to make U.S. manufacturing non-competitive," a statement which Trump later said was a joke.
او همچنین گفته که «مفهوم گرمایش جهانی از سوی چین و برای غیررقابتی کردن تولید در آمریکا ایجاد شده‌است» گرچه او بعدتر توضیح داد این یک جوک بوده‌است.