Nokia promised a little while ago to "go green", and today it seems they are living up to their promise. Nokia recently announced plans to halve the power consumption of battery chargers to their various devices, including cell phones and PDAs. Since you obviously don't get something for nothing, the secret behind this decrease in power consumption lies in increasing the power efficiency of the original units. Nokia has already done quite a few things to help with the eco-friendly movement, including make several handsets out of recycled materials. They've also devised AC adapters that are 94% more efficient than EPA standards require.
Source: Reg Hardware