Steven E. Koonin

“I would have offered a somewhat different statement, based upon my familiarity with the assessment reports and literature: The earth has warmed during the past century, partly because of natural phenomena and partly in response to growing human influences. These human influences (most importantly the accumulation of CO2 from burning fossil fuels) exert a physically small effect on the complex climate system. Unfortunately, our limited observations and understanding are insufficient to usefully quantify either how the climate will respond to human influences or how it varies naturally. However, even as human influences have increased almost fivefold since 1950 and the globe has warmed modestly, most severe weather phenomena remain within past variability. Projections of future climate and weather events rely on models demonstrably unfit for the purpose.”
― Steven E. Koonin, Unsettled: What Climate Science Tells Us, What It Doesn’t, and Why It Matters