Later in his career, Jaworowski disputed that ionizing radiation from the Chernobyl disaster was a major catastrophe for human health and wrote that the movement to remove lead from gasoline was based on a "stupid and fraudulent myth".
Jaworowski suggested that the long-term CO2 record is an artifact caused by the structural changes of the ice with depth and by postcoring processes.
[7] Stephen Schneider said of him that "Jaworowski is perhaps even more contrarian than most, claiming that he can prove the climate is going to get colder through his work excavating glaciers on six different continents, which he says indicates what we should really be worrying about is 'The approaching new Ice Age...'.
After Ukrainian environment minister Yuriy Shcherbak published an article in Scientific American raising concerns about the long-term effects on children in high-radiation areas, Jaworowski pushed back, arguing that increased rates of thyroid cancer could have had other causes and questioning why rates of other types of cancer had not increased.
Jaworowski also rejected the linear no-threshold model (LNT) for what he considered its poor scientific basis and the "dubious moral aspect of its applications".
He argued for dropping LNT from radiation protection regulations and thought that radiophobia was the result of decades of anti-nuclear and anti-radiation propaganda.