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.
1 But this religion has in Iran only 60,000. There is, however, another language, the Dari-Zoroastrian, which had 11,500 speakers in 1999. It appears that these two are the same, but that the latter is the only correctly updated.  Bashkardi, Natanzi, Nayini, Sivandi, Soi and Gazi all listed with 7,030 speakers in 2000.