The document discusses the need for more energy efficient wireless networks to address massive growth in data traffic and the carbon footprint of ICT. It outlines the work of GreenTouch, a research consortium aiming to increase network energy efficiency by a factor of 1000 through projects on technologies like massive MIMO, small cells, and network management. Specific projects explore using large antenna arrays, heterogeneous networks, and independent network configuration for signaling and data. While promising results have emerged, much work remains to fully realize dramatic efficiency improvements over the long term evolution of cellular networks.