The official Uefa fan zone in England is at Trafalgar Square in London. Entry is free, with tickets allocated via ballot. It will screen all England games plus the semis and final.
From Seville in the west of the continent to Baku 4,766km away in the east, significant amounts of air travel will be involved at Euro 2020 - both for players and the thousands of fans wanting to watch their team.
Covid restrictions mean the volume of air traffic will be far lower than one initial estimate of an extra two million plane trips during the tournament, but it will still be significant.
Andrew Simms, Rapid Transition Alliance co-ordinator and co-director of New Weather Institute, said: "It's almost like going out and saying: How can we design a competition to maximise our environmental impact?"
There are also doubts about the merits of encouraging fans from 24 nations to potentially visit up to five different countries in the space of a month during a pandemic.
Entertainment data analysts Gracenote have predicted England as the second most likely winners - behind Belgium by less than 1% - because of their practical home advantage.
France are considered by many as the favourites. The world champions (and Euro 2016 finalists) have a hugely impressive starting XI and squad depth and are boosted by the return of prolific Real Madrid striker Karim Benzema from a long international exile.
As already discussed England are likely to be one of the favourites, with potentially six of seven games at Wembley. If they win their group their only game abroad - if they go all the way - would be a quarter-final in Rome.
The last-16 tie for the winners of their group should have been in Dublin, but was moved to Wembley when Ireland could not guarantee allowing fans to games.
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