This article gives the impression that 'carbon chauvinists' believe that carbon is the only possible basis for life solely because that is what life is based on on Earth. I would think most 'carbon chauvinists' would hold that only carbon-based life is possible, not just because that is how life is on Earth, but also because carbon based compounds are more common in the universe in general, and they form more easily and are more versatile than silicon-based compounds. -- SJK