This is an amusing and antique take on things. Anti-nuclear protests were frequently in the news in the 70s and 80s. As a result, some people with views set in stone in their youth believe that environmentalists are still predominately anti-nuclear.
In a strange twist of fate, this mindset is actually helping things today. The US President, likely motivated by a desire to own the libs and punch environmentalists in the face, plans to pour $4T into nuclear, making him an unintended climate change warrior, some say the greatest ever.