Geography of Uzbekistan Kazakhstan, also yielded about 60% of the total volume of Central Asia's emissions of harmful substances into the atmosphere. Because automobiles are relatively scarce, automotive exhaust is a problem only in Tashkent and Farghona. The reduction of water in Uzbekistan has resulted in soil degradation, and the spread of the salt from the evaporated Aral Sea has contaminated the surrounding soil. The soil has lost much of its water due to the increased surface irrigation. The irrigation of farmlands with water from the Aral Sea has resulted in increased salinization of the soil, causing the farmland to be less productive
Science and technology in Kazakhstan manufacturing and construction. For Central Asia, the generic term of PhD also encompasses Candidate of Science and Doctor of Science degrees. Data are unavailable for Turkmenistan. Table: Central Asian researchers by field of science and gender, 2013 or closest year Source: "UNESCO Science Report: towards 2030" (2015), Table 14.1 The number of scientific papers published in Central Asia grew by almost 50% between 2005 and 2014, driven by Kazakhstan, which overtook Uzbekistan over this period to become the region's most prolific scientific publisher, according to Thomson Reuters' Web of Science (Science Citation Index Expanded). Kazakh scientists specialize in physics, followed