The Internet of Things (IoT) has been envisaged to describe a number of technologies and research disciplines that enable global connectivity over the worldwide physical objects. Enabling technologies like Radio-Frequency Identification (RFID), sensor networks, biometrics, and nanotechnologies are now becoming very common, bringing the IoT into real implementations addressing varying applications, including smart grid, e-health, and intelligent transportation. They foreshadow an exciting future that closely interconnects our physical world via green networks. Green networks in IoT will contribute to reducing emissions and pollutions, exploiting environmental conservation and surveillance, and minimizing operational costs and power consumption.