This really interesting map on International Institute for Environment and Development’s website, iied.org, shows populations of cities with more then 500,000 people from 1800 to the predicted 2030. The visual that this map gives shows how big our world really is. With a little more than 7 billion people right now, by 2030 that amount will surely grow. Makes you think about what the health, environment, food and water situation will look like when the predicted population for 2030 will be more then 8 billion. I think that if we can increase education efforts on population rise and conservation efforts, we can help to lessen that number or at least be more prepared.
Below is a screenshot from iied.org of cities in 1800 that had more than 500,000 people. London and Beijing had more than a million and Guangzhou and Paris are between 500,000 and a million people.