American Teens’ Knowledge of Climate Change reports results from a national study of what American teens in middle and high school understand about how the climate system works, and the causes, impacts and potential solutions to global warming. There are 75 individual questions. A straight grading scale was constructed (scores 90% and above = A, 80-89% = B, 70-79% = C, 60-69% = D, and scores 59% and below = F), using only items for which there was a correct or best answer.