economist intelligence unit's ranking of the most livable cities
World's most liveable cities Melbourne, Australia, has been ranked by the EIU as the world's most liveable city for seven years in a row, from 2011 to 2017.[6] Between 2004 and 2010, Vancouver, Canada, was ranked the EIU's most liveable city, with Melbourne sharing first place in the inaugural 2002 report. Vancouver has ranked third since 2015, while Vienna, Austria, has ranked second.
Megacity In 1800, only 3% of the world's population lived in cities, a figure that rose to 47% by the end of the twentieth century. In 1950, there were 83 cities with populations exceeding one million; by 2007, this number had risen to 468.[24] The UN forecasts that today's urban population of 3.2 billion will rise to nearly 5 billion by 2030, when three out of five people will live in cities.[25] This increase will be most dramatic on the least-urbanized continents, Asia and Africa. Surveys and projections indicate that all urban growth over the next 25 years will be in developing countries.[26] One billion people, almost one-seventh of the world's population, now live in shanty towns.[27] In many poor countries overpopulated slums exhibit high rates of disease due to unsanitary conditions, malnutrition, and lack of basic health care.[28] By 2030, over 2 billion people in the world will be living in slums.[29] Over 90% of the urban population of Ethiopia, Malawi and Uganda, three of the world's most rural countries, already live in slums.