Not enough mana to add these, but:

• % of the world population living in democracies (as measured e.g. by The Economist Democracy Index);

• % of the world population living in countries without a pressure to vote for one of the two major parties on pain of "wasting the vote", and instead with an assurance that their vote counts the same if they choose other parties (i.e. proportional representation);

• % of the world population living in countries where one cannot get "stuck" with an incompetent, corrupt or politically unsuitable Head of Government, and instead with the possibility to replace them by a simple majority vote in the legislature (i.e. parliamentary government)

If you write me specific figures referring to year 2023 and the sources, I can add them for you

Hm, I'll have to do that piecemeal. I'm not sure what the best source is for just listing the population of each country in the world in any given year - sources often use the latest available figure, which is often not consistent with each other. One page I think of is populationpyramid.net.

I think it is very likely that the Economist Democracy Index will still be around in 2029, that's the source for whether a country is a democracy – either full or flawed. If the definitions change, we'll try to apply the new ones as much as we can (for example, if the scores remain the same but the names change, we'll use a score of 6.00 as the minimum for democracies). If the Index is no more, Freedom House will be used as a fallback.

For proportional representation, a country counts if Freedom House lists it as an "electoral democracy" (a different, easier criterion than The Economist's) AND Wikipedia says it uses PR (https://en.wikipedia.org/wiki/Proportional_representation#List_of_countries_using_proportional_representation). To make things simple, let's say it doesn't matter how proportional the system is - MMM can be kinda bad if there are not a lot of seats in the PR tier, for example, but we won't get into those details.

As for parliamentary systems, what counts are countries that are democracies according to The Economist AND Wikipedia says are parliamentary. The thing that we're going for, which Wikipedia will represent faithfully, is:

• the legislature is democratically elected;

• it elects the Head of Government;

• it can dismiss it at any time for reasons of political convenience.

None of the following things matter for this subquestion:

• whether the Head of Government is also Head of State;

• whether dismissing a Head of Government can only be done in the same process as electing a new one (constructive motion of no confidence);

• whether the Head of Government can get the legislature dissolved.

I'm gonna set up a spreadsheet with the data on that at some point in the next week.

@BrunoParga let us know if you have updates

@SimoneRomeo hi. I apologize for not following through on this at that time, and at the moment my priorities have shifted away from this. I would love to see this done by someone, but I won't do it myself.

Is your measure of "less polluted" CO2 emissions? that seems like both a limited (there are other kinds of pollution; no CO2 but a bunch of mercury in the water would not be good!) and a strange (if everyone died and all the factories went silent because CO2 choked us all, emissions would go to ~0) metric, to me.

Yeah, I suggest renaming it to "World will be polluted less quickly" or "World pollution will slow down".

@Shemetz renamed to "CO2 pollution will slow down"

@mattyb Beat me to it lol.

Beat me too