Here is an example of green screen being used, this photo was from the film Avengers Assemble.
In 1898 'Four Head Are Bette Than One' film created by Georges Méliès performed the first visual effect which we now call green screen
The matte technique was used again on Edwin S. Porter’s 1903 The Great Train Robbery but this time not as magic trick but to create the effect of being on a train and realism which would of probable been a very successful film in its time as there wasn't anything like it, it was like magic in those times.
In the modern world Green screen is used nearly all the way through films, films these days could not develop or be near as good as they are without this technique, it is used all over the world and for nearly everything you see in films.
The blue screen method was developed in the 1930s at RKO Radio Pictures.
In 1950, Warner Brothers employee and ex-Kodak researcher Arthur Widmer began working on an ultraviolet travelling matte process. He also began developing bluescreen techniques: one of the first films to use them was the 1958 The Old Man and the Sea.
In this clip green screen would of be used through the whole clip as it creates a real feel of danger and excitement. Using this green/blue screen there were able to do make the suit change from a suitcase to the full body suit and this effect work really well and you don't even notice is a special visual effect.
They demonstrate in this clip how much green and blue screen is used, once you see this clip you'll never look at TV the same again. The use of Chroma key, which is the process of elimnating the green/blue and replacing it with something that you wish is a very good and effective technique to used as you can't tell the difference between what is real and what isn't. Their isn't a specific example to refer to in the film as all of it, it just amazing to watch and to observe, it opens your mind up to wonder to what extent to what you really see and hear on TV and film are real?
Green is currently used as a backdrop more than any other color because image sensors in digital video cameras are most sensitive to green, mimicking the human eye's increased sensitivity to green light. Therefore, the green camera channel contains the least "noise" and can produce the cleanest key/matte/mask. Bright green has also become favored since a blue background may match a subject's eye color or common items of clothing such as jeans.
Blue was preferred as a backdrop before digital keying became commonplace because of the existence of high contrast film that was sensitive only to the blue color.
A detailed history of Green screen:
http://zephyrphotoworks.com/greenscreenDetail/136
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