> "I remember similar stories about solar panels and wind energy decades ago, and they are definitely viable now. " I remember similar stories about ubiquitous

> "I remember similar stories about solar panels and wind energy decades ago, and they are definitely viable now. " I remember similar stories about ubiquitous hypersonic air travel and colonies on the moon decades ago and they are definitely still not viable now. There is no guarantee that the necessary breakthroughs are going to occur (and the article does make it clear that a lot of breakthroughs are going to be needed) and it's wishful thinking to believe otherwise.