Help! My pale leather suite is turning green!

[scrummyyummy]

I have a pale beige coloured leather suite which is in the conservatory and it's turning a pale green colour! I've only had it about 4 years. It's not anything growing on it as it's actually the colour that's changing. All I can think of is because it's in a sunny and bright room and that's what's causing the change. Is there anything I can do to get the original colour back?

[NoMercy]

DIY products can be less than useful. You would be better having it restored professionally.