States, 80% of tea is consumed as iced tea. Sweet tea is native to the southeastern U.S. and is iconic in its cuisine. Economics Tea is the most popular manufactured drink consumed in the world, equaling all others – including coffee, soft drinks, and alcohol – combined. Most tea consumed outside East Asia is produced on large plantations in the hilly regions of India and Sri Lanka and is destined to be sold to large businesses. Opposite this large-scale industrial production are many small "gardens," sometimes minuscule plantations, that produce highly sought-after teas prized by gourmets. These teas are both rare and expensive and can be compared to some of the most expensive wines in this respect. India is the world's largest tea-drinking nation, although the per capita consumption of tea remains a modest per person every year. Turkey, with of tea consumed per person per year, is the world's greatest per capita consumer. Labor and consumer safety problems Tests of commercially popular teas have detected residues of banned toxic pesticides. Tea production in Kenya, Malawi, Rwanda, Tanzania, and Uganda has been reported to make use of child labor according to the U.S. Department of Labor's List of Goods Produced by Child Labor or Forced Labor. Workers who pick and pack tea on plantations in developing countries can face harsh working conditions and may earn below the living wage. Certification Several bodies independently certify the production of tea, such as Rainforest Alliance, Fairtrade, UTZ Certified, and Organic. From 2008 to 2016, sustainability standards-certified tea production experienced a compound annual growth rate of about 35%, accounting for at least 19% of overall tea production. In 2016, at least 1.15 million tonnes of sustainably certified tea was produced, valued at US$2 billion. Rainforest Alliance certified tea is sold by Unilever brands Lipton and PG Tips in Western Europe, Australia and the U.S. Fairtrade certified tea is sold by a large number of suppliers around the world. UTZ Certified tea is sold by Pickwick tea. Production of organic tea has risen since its introduction in 1990 at Rembeng, Kondoli Tea Estate, Assam. tons of organic tea were sold in 1999. See also Cannabis tea Chifir', Russian extra-strong tea brew Herbal tea Frederick John Horniman Indian Tea Association International Tea Day ISO 3103 Kombucha, drink produced from bacteria and yeast grown on tea List of Chinese teas List of hot beverages List of national