EDITING + WORKFLOW: Why is there a green tint to my photo?

What you're seeing is primarily happening in the camera calibration panel on the "Shadow Tint" slider. Many of the film presets put this to a negative value as this matches what several of the real films do. However, some may not like this look and that is what the "Toning - None" preset in the toolkit fixes. Additionally, you could try setting your own value for a lesser version of the same look.

Green_tint_to_my_photo_-_sliders.png    toning_toolkit_options.png