Cloud service providers invest in the necessary infrastructure and management systems, and in return receive a time-based or usage-based fee from end users [17]. Cloud computing is emerging today as a commercial infrastructure that eliminates the need for maintaining expensive computing hardware.
Area: 9,400,000 sq.km. Population: 2.5 million people. Population density: o.4/sq. km or less than 1 person per sq mi. Sahara is the largest non-polar desert and the hottest of the sub-tropical deserts in the world. The desert can be estimated nearly as large as USA or China. Sahara covers most of the north-Africa under its belt by bordering with Red Sea, touching Mediterranean coasts to Atlantic shelves.
China's largest desert extends over 123,550 square miles of the Autonomous Region of Xinjiang in the Tarim Basin. Composed primarily of shifting crescent sand dunes, the Taklamakan is one of the largest sandy deserts in the world. Despite the inhospitable and unpredictable nature of the desert sands, the Chinese government erected a road across the desert in the mid-1990s.