How much of TV is fake?

You would assume that the massive, wide shot of the destruction following the black out in Flash Forward is fake. It even looks it. A lot of times it's obvious when things aren't real on television. The lack of budget and time to execute often result in poor special effects (Lost is a clear example of this, some of the worst sfx of any show out there) but you would probably be surprised to discover that a lot of seemingly small scenes, ones that seem really easy to shoot, are also done on green screen.

Stargate Studios has released a youtube montage of SFX shots for television shows, revealing when green screen is used. It's pretty cool. Check it out below: