Made by overlaying two shapefiles of countries in qgis and adding custom points onto in a text editing application.
This map is interesting for a few reasons, the first being that it shows profeciency in the D3 program. Another reason is that the different shades of gray look very artistic.
Q1: Montreal, Canada Q2: The var svg element Q3: 180 is the prime meridian and 90 centers on the Americas. Q4: text-decoration: underline