Nokia announces with the Nokia 3110 Evolve a 'Green' cell phone.

The Nokia 3110 Evolve is an attempt to make an environmentally friendly mobile phone.
The Nokia 3110 Evolve is a mobile device with bio-covers made from more than 50% renewable material. Presented in a small package made of 60% recycled content and the Nokia 3110 Evolve comes with Nokia's most energy efficient charger yet, using 94% less energy than the Energy Star requirements.

Other features of the tri-band GSM Nokia 3110 Evolve include a 1.3MP camera, FM Tuner and microSD card slot.

I don't see enough 'green' reasons to choose this phone above others. It is not enough to leave out feature-set and actual needs to make a purchase decision for a mobile phone.
Via this Nokia press-release from the Nokia World Conference.