Reports by the Congressional Research Service from 2008 discuss emerging policy issues regarding carbon dioxide pipelines for carbon sequestration, network needs and cost uncertainties regarding pipelines for carbon dioxide control, and jurisdictional issues in regulating carbon dioxide sequestration pipelines.
Total numbers of speakers is high: over 40 million Farsi speakers (about 60% of Iran's population); over 14 million Dari Persian speakers in Afghanistan (50% of the population according to CIA World FactBook & Britannica); and about 2 million Dari Persian speakers in Pakistan.
322 million people speak english as first language, and 500 million speak it as a second language. Its almost around a billion in total. Yet the world population is 6 Billion +. So i believe that it is only 30% maximum. And will decrease in the future.