Another take on world population as bubble areas, this time with almost no geography at all. Countries are grouped and colored according to their continent.
Data from Natural Earth & data.worldbank.org.
https://d3js.org/d3.v4.min.js
https://d3js.org/d3-selection-multi.v0.4.min.js
https://d3js.org/topojson.v2.min.js