"Two thousand years ago, English did not exist. A thousand years ago it was a language used by less than two million people. Now it is the most influential language in the world, spoken by more than a billion people on the planet, as their first, second, or third language. English currently dominates science, business, the mass media, and popular culture. For example, 80% of emails on the internet are in English."
What is the main idea of the passage?