COVERING MOST OF the Arabian Peninsula, the Kingdom of Saudi Arabia has a land area of 829,996 sq. mi. (2,149,690 sq. km.), with a population of 24,735,000 (2006 est.) and a population density of 29 people per sq. mi. (11 people per sq. km.). Riyadh, the capital and the largest city, has a population of 4,193,000 and has a population density of 3,891 per sq. mi. (1,500 per sq. km.). Some 2 percent of Saudi Arabia is arable land, with a further 56 percent used for meadows and pasture. With a high standard of living coming from the petroleum industry, and fossil fuels being used for all the country's electricity production, Saudi Arabia has a high rate of per capita carbon dioxide emissions, rising from ...