The infograph information provided in this article is a decent starting point but I wonder... why they stopped there?
Why was there not mention of Franciacorta or Cremant? Franciacorta is a DOCG in the province of Brescia (Lombardy) not far from Milan. For Italians, this is their Champagne and is starting to garner international recognition. Cremant (French for creamy) is made as AOC wines in 8 regions. The method used has lower carbon dioxide levels and is said to create a creamy mouth feel rather than a traditional fizzy one (hence the name).
There are many styles of Cremant (pronounced cray-mont) and one produced in Luxembourg.
Brachetto is a sparkling red wine made from Italian Bonarda grapes. There are many regions in the US that are producing sparkling wines (from Virginia to California).
We might suppose that many Fermented Globetrotters either regularly consume good sparkling wine or will (as they learn more about the various types).
At some point we will discuss the difference of Champagne from the large (well known) Champagne House to the small grower producers scattered throughout the Champagne of northern France.