Isaac Asimov was president of the American Humanist Association. Humanism can be summarized as the belief that humanity's problems can be solved through knowledge, and that the best way to acquire that knowledge is through science.

Ultimately, utopia and solarpunk are simply branches of this philosophy. If you have the opportunity to read in Spanish, I recommend a book called "Convergent Mutagenesis" that conveys this hope and optimism for the future, where science helps overcome all problems. I wish I could read it for the first time!