That green tinge looks like it's a reflection off the grass. Unless you're eye is real good - there is no way your eye would have caught that.
The camera can't 'know' what to include or eliminate - it does the best it can by automatically averaging out every scene it records unless you dial in (camara permitting) a manual setting yourself.
For this green tinge problem, the easiest solution is to use a graphics program to reduce the green cast.
Hope that helped,
Marko
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