Global warming is caused by polluters such as carbon dioxide, methane and CFCs.Đoạn văn18/55Mark the letter A, B, C or D on your answer sheet to show the underlined part that needs correction in each of the following questions. Global warming is caused by polluters such as carbon dioxide, methane and CFCs. such aspollutersmethane and CFCsis causedGiải thíchChọn B