To celebrate Earth day, geekaphone created a very well done infographics to show how green is our iPhones. To be honest, I feel that Apple is already one of the most environmental conscious company around. Most of their products have 5 star on green-ness. If you look at the info-graphics, you will see that Apple is still trying their best make their next product greener, look at iPhone 3G and iPhone 4, iPhone 4 emit 18% less CO2.
Take a look at the inforgraphics from geekaphone: