Tom Wilson asked Ralph B. Alexander:

I value your opinion although it appears to be the small minority opinion. Do you know of any scientist who used to think AGW was a serious problem and now, after studying the data, has determined that AGW is NOT a problem? There are many people like you who have always thought AGW was not a problem. I'm no expert so my opinion is not important.

Ralph B. Alexander A good question, Tom - though I wouldn't call myself an "expert". I actually know of several scientists who switched from alarmist to skeptical views on AGW, and I'm sure there are more. The reason I say this is that skeptical opinions about AGW go against the mainstream, as you correctly point out, so most skeptics don't come out of the skeptical closet until they retire - when their politically incorrect views can no longer cost them research funding or advancement in their careers.
Three scientists I know of who made such a conversion are Judith Curry, former chair of climate science at Georgia Institute of Technology (see https://www.nature.com/news/2010/1011... Anastasios Tsonis, retired professor of atmospheric science at the University of Wisconsin (see https://www.thegwpf.com/anastasios-ts... and Rex Fleming, former scientist for the U.S. National Oceanic and Atmospheric Administration (see https://onenewsnow.com/science-tech/2...).
Incidentally, I personally haven't always been a skeptic, as I explain in the Preface to the 1st edition in "Global Warming False Alarm."
Prominent AGW skeptics who have always held the same view include Patrick Moore, PhD in ecology and one of the founders of Greenpeace (which he left), and a Nobel Prize winner in physics.

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