In a football game played between Denmark & Brazil, the field itself was digitally rotted and gradually changed the color to brown, to remind the audience that every four minutes an area as large as a football field is cleared in the rainforests of Brazil.
When people were freaking out (right here on adland, in our forums!) way back in the 90s about our ability to digitally enhance a broadcast live, nobody seemed to think of it being used on a scale like this and for WWF too.
It might have been a pain to watch that game though, seriously distracting.
Grey Brazil