I guess if you're optimizing on the other metrics, yes, but if you're optimizing for CO2 only the best solution may not necessarily be where someone is already

I guess if you're optimizing on the other metrics, yes, but if you're optimizing for CO2 only the best solution may not necessarily be where someone is already located. However, I did try putting in e.g. 10 x Boston, 1 x London, 1 x Paris, and it did in fact suggest Boston as the meeting point. Realistically, it is often also the case that the announced location of a meeting influences who attends it, as compared to travelling for a conference (flights + lodging + meals), the costs are much, much lower for people who already live in that city, who need to only buy the entry ticket. So if you announce a conference in Paris instead of Boston you might expect a bunch of people who already live in Paris to suddenly want to attend. This effect is hard to account for.