At Massachusetts Institute of Technology, Christopher Love and colleagues are working to find out whether energy from trees can be used to prevent forest fires. A sensor system taps into trees as a self-sustaining power supply. Each sensor is equipped with a battery that can be slowly recharged using electricity generated by the tree. The system produces enough electricity to allow the temperature and humidity sensors to wirelessly transmit signals four times a day, or immediately if there's a fire.
Still no match for the blogging houseplant . . .
Also: The RFID and the saguaro