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.
The official language of Iran is only one: Persian. Seven more languages are recognized regional languages: Azerbaijani, Kurdish, Lori, Mazandarani, Gilaki, Balochi and Arabic. The map of languages spoken in Iran is as complex and confusing as is the case with ethnic groups. Ethnologue lists as many as 66 languages, of which 31 has more than 20,000 speakers. Sizeable languages, with more than 1 million, count as many as 12.