Certain major media outlets have reported that nearly all qualified scientists agree that global warming is a serious problem. However, these claims are based on non-representative polls that ask if human activity has contributed to warming, not if it presents a serious threat. In contrast, 3,805 scientists with degrees in atmospheric, earth, or environmental science and 9,029 Ph.D.'s in varying scientific fields, have signed a petition stating: "There is no convincing scientific evidence that human release of greenhouse gasses is causing or will, in the foreseeable future, cause catastrophic heating of the Earth's atmosphere and disruption of the Earth's climate."