One Tree Planted
A great resource to offset your carbon emission on a film set and to make a tax deductible donation on behalf of your crew and cast is the "One Tree Planted" program. This company plants 1 tree for each $1 donated. If you sign up as a company partner - you will also get access to their large stock footage database with a lot of fantastic nature shots that you can use as B-Roll for your projects. It's a win-win!