Sensible Nobel laureates study new topics before offering strong opinions on them. For example, at nearby Stanford, Burton Richter “retired” from high-energy physics, and kept contributing, as in talks, book and energy efficiency project. Former U.S. Secretary of Energy Steven Chu has no problem speaking on climate science. Of course, both have easy access to top climate scientists.
By contrast, Ivar Giaever (1929-) did a bit of online searching in 2008, decided climate scientists were wrong, and has been saying so ever since, making him a hero to climate deniers unable or unwilling to assess his lack of credibility.
Even the world's best brain surgeon is useless for open heart surgery unless they spend much time retraining.