The new phone uses "bio-covers" that, are said, to be made from over 50% renewable material. It also uses smaller packaging made of 60% recycled content. Nokia have also thrown in their best energy efficient charger. The charger uses 94% less energy than the Energy Star requirements.
If you are in the need for a new phone this one might be worth to take a closer look at. But please, do not throw away your already working phone.