If they haven't started yet, soon -- very soon -- I think your customers will be looking to you to show some forward motion towards improving the environment. Or at least damaging it less.
Others will need to radically redesign and reduce packaging.
Most will need to find better ways to do things (process innovation) that cause less damage to the environment. And then they'll need to tell customers what they are doing. This one is going to be hard work, but frankly essential to the future of your brand. [Assuming the larger issue doesn't warm your heart.]
To find resources to get started, it looks like the Pew Centre for Global Climate Change might have some useful resources. One item in particular was flagged in the March 2007 Harvard Business Review: Getting Ahead of the Curve: Corporate Strategies That Address Climate Change, by Andrew Hoffman. Download it free, here. Bronwyn Fryer, who reviewed the report for HBR, nails the challenge when she says,
"God help you if you're running a corporation. Faced with the inevitability of more and more climate-based regulatory constraints upon companies, business leaders need to do far more than propose a 'Ride Your Bike to Work' day."
Harvard Business Review, March 2007, book review by Bronwyn Fryer
Pew Centre on Global Climate Change, Pew Research describes themselves as a "nonpartisan ''fact tank' that provides information on the issues, attitudes and trends shaping America and the world. It does not take positions on policy issues."