Unsettled: What Climate Science Tells Us, What It Doesn’t, and Why It Matters

by Steven E. Koonin

•“. . . low confidence regarding the sign of trend in the magnitude and/or frequency of floods on a global scale.”1 •“. . . low confidence in a global-scale observed trend in drought or dryness (lack of rainfall) since the middle of the 20th century . . .”2 •“. . . low confidence in trends in small-scale severe weather phenomena such as hail and thunderstorms . . .”3 •“. . . confidence in large scale changes in the intensity of extreme extratropical cyclones [storms] since 1900 is low.”