You'll always have cultural diversity: different accents, different usage, localized vocabulary due to different environments.
I fully support the idea of a world language. I'd recommend using a Korean-style phonic writing system with extended characters (look up Korean writing system, it's really simple and great).
I fully support the idea of a world language. I'd recommend using a Korean-style phonic writing system with extended characters (look up Korean writing system, it's really simple and great).