Reducing power consumption helps fighting global warming and also helps in saving environment, so try some tricks to save some battery of your cell.
1) Don't used key-pad sound. Turn it off.
2) Don't used tone+vibration 4 call/SMS, only used tone as vibration consumes more battery.
3) Don't use maximum brightness on your display.
4) Try to avoid listening songs using Headphone.
5) After data transfer turn off bluetooth/infrared.
6) Don't use cell as modem for net and recharge it at same time.
7) Don't turn off/on your cell so many times as its consumes more battery.
8) Use energy-saving settings as its great way of reducing the overall electrical consumption of your phone, especially if you turn off the back light. Screen-savers are also huge power drains, as they animate the screen even when the phone is still in the pocket.
9) Bluetooth headsets use more power compared to normal headsets so where avoidable use wired headset.
10) Turn off charging when battery is already full and try to save battery by using your cell only when needed.