You can also take a peak at Dig It, a full-fledged documentary online, as part of the Do Something Reel film festival. I particularly enjoyed when the focus turns to trees (green!) around 21:30. Trees are kind of awesome - they cool their surroundings, utilize carbon dioxide and release water, increase water infiltration and reduce soil erosion, and provide food. Although, I have to say, the NYC water filtration example was actually primarily on farm/dairy operations and not forests, but the principle is still there...
I could expound upon this topic for a good while, but it's late, so I will leave you with a recipe to add greenness to your life. It can easily be done with other seasonal mild greens and juice from local fruit...
Green Monster Smoothie
2/3 cup diced apple and/or pear
1/2 cup spinach leaves
1/2 lemon, juiced
5 drops stevia
1. Blend all ingredients together. For a little less thickness, add a bit of water or apple juice/cider. Enjoy the green goodness!