Brave is using a USPS commercial mailshot service which openly encourages the use of personally identifiable information to target unsolicited marketing (name, age, income(!) and other demographic info) to promote the idea it respects privacy and opposes collecting data to run ad campaigns for third parties. That's not a great look, and explaining that actually this shouldn't have been a problem because (like the customers of Facebook, Google and most display ad networks) the service they're paying keeps the targeting data to itself is probably even worse.
Similarly, you can't use the tool to send mail to 40 year olds, you can just see that the route you selected is 40% over age 40, or whatever.
(Regoogling that second figure returns some ranges as low as 1-2 lb/lb, which would put junk mail at like 0.2-0.4 crypto.)
The error bars all overlap, so the closest I can do with the level of work I'm willing to put in is that junk mail might be a little bit more CO2 than cryptocurrency (or twice as much as Bitcoin), or like 5% of cryptocurrency at the other extreme.
Personally, I'm convinced that the recycling system as a whole requires a certain base amount of input material to even function and that junk mail serves a useful purpose by providing a good portion of that base amount of input material.
Wood pulp and recycled pulp are both in incredibly high demand at the moment and both incredibly cheap to use.
I can't speak for global stats, but here in England, as of 2018, we were importing over $600 million of just recycled paper to use from abroad! [ https://www.statista.com/statistics/490038/eu27-import-value... ]
This is a four year old article and Edmonton hasn't changed the recycling system at all. It's still blue bags that get tossed into a truck, compacted, and presumably nothing useful happens.
On the garbage side, we now have bins that can be emptied by an arm on a truck and we separate garbage from organics. The organic material apparently gets composted, but I'm not sure what happens after that.
[0] https://edmontonjournal.com/news/local-news/its-not-worth-it...
> AF&PA and Industry Partners Aim to Set the Record Straight – Pizza Boxes Are Recyclable, Grease and Cheese Not an Issue
https://www.afandpa.org/news/2020/afpa-and-industry-partners...