What is the Crysis:Natural Mod?

What is the natural mod for crysis? What is it made for?
Can it run on Warhead? And do you need a stronger GFX card?

The objective of this mod is to transform the ambient atmospheric lighting to make Crysis much more realistic.Modified singleplayer levels * Island - Contact
* Village - Recovery
* Rescue - Relic
* Harbor - Assault
* Tank - Onslaught
* Mine - Awakening
* Sphere - Exodus
* Ascension - AscensionWhat does the Natural Mod add to Crysis? * realistic atmospheric lighting
* realistic dusk and dawn
* realistic ambient fog
* realistic sun
* realistic night
* realistic moon position

I wouldn't know if it would work on another version on Crysis as I just quickly Googled this.

ah 'kay, thanks