There will be several areas a manufacturer can be more environmentally friendly, the below document looks at it more thoroughly and gives some case examples.
Many things will ultimately be the decision of the directors/owners, but just thinking from how you can affect change as a QA, the main thing that comes to mind is reducing waste. Technical could potentially aid this by helping to keep product within specification to reduce waste, and re-working as much as possible - within the compliance of your food safety & quality standards of course.
You could suggest other things to management i.e. recyclable packaging, local suppliers, re-usable equipment. Though 'cost' will likely be your barrier to any suggestions, unless it coincidentally works out cheaper for the company.
This is an interesting topic, I expect we may see a larger focus on it within the next decade in standard requirements and regulations. The consumer attitude certainly seems to be changing anyway.