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[–] Mikel777 0 points 0 points (+0|-0) ago 

Explain why they would bother with a greenscreen with a city background when they already were in the city with a city background


[–] mostlyfriendly 0 points 3 points (+3|-0) ago 

Happens all the time. If you see a back drop that isn't at the street level, vast majority of the time it is a green screen.

Lighting is critical for live production TV. It's difficult to control lighting in a studio that has windows. Sun glare / too much lighting / too little lighting / etc. A simple shift in cloud cover in the middle of the shot can screw things up.

Unless they can get consistent lighting (i.e. morning show where the show is the same time very day) and where crowd interaction is key and worth the extra effort (again - morning shows), then it is far easier to take a live shot (or a per-recorded shot) and overlay an green screen actor.