The New Nokia Eco-Sensor Concept. Looks like a very promising concept.
The concept consists of two parts – a wearable sensor unit which can sense and analyze your environment, health, and local weather conditions, and a dedicated mobile phone.
The sensor unit will be worn on a wrist or neck strap made from solar cells that provide power to the sensors. NFC (near field communication) technology will relay information by touch from the sensors to the phone or to or to other devices that support NFC technology.