Digital Photography School has an important post in honour of Blog Action Day, describing How to Be an Environmentally Friendly Photographer.

Darren lists 7 important principles we should all abide by when trying to get that perfect shot:

• Avoid Destruction to Get a Shot
• Obey Instructions
• Take Out What You Take In
• Leave What You Found Where You Found It
• Travel Light
• Don’t Disturb the Animals
• Go With Rechargeable Batteries

For further expansion on those points and a thoughtful read, I highly recommend reading the whole post.