* Data Collection Challenges: Gathering accurate data on language proficiency is difficult. There are many languages and dialects, and people's fluency levels vary greatly.
* Definitions of "Speak No English": What does "speak no English" mean? Can someone understand a little English but not speak it? What about people who can read but not speak? These nuances make it hard to establish a clear definition.
* Constant Change: Language usage is dynamic. People learn new languages, and the number of English speakers is constantly growing.
However, we can make some general observations:
* English is a widely spoken language: It's estimated to be a first or second language for over 2 billion people.
* Many languages exist: There are thousands of languages spoken around the world, and many people are monolingual in their native language.
Instead of focusing on a percentage, it's more accurate to say that a large number of people worldwide speak languages other than English. This emphasizes the diverse linguistic landscape of our planet.