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Unless you have set white balance to fluorescent or something, I dunno...
If you have any doubt, why not take yours into a local store and snap a few pics with yours, then with the store demo?
If it's hardware when you think it's software, you'll be waiting a long time for the fix - past your return date.
If it's software, you'll know that, too.
Whatever it is, mine doesn't look green like that.
We also have a lot of threads opening on camera issues, many of which are similar - please look around for camera posts, there ought to be several on the first two pages alone, especially if you filter prefixes for Support (top of column that says General, Support,... is the selector).