This document discusses Green IT and how IT organizations can reduce their environmental impact. It defines Green IT as designing, using, and disposing of technology efficiently and with minimal environmental impact. It notes that energy use in data centers has doubled in recent years and could double again by 2011 if efficiency does not improve. The document recommends virtualization, consolidation, efficient cooling and cloud computing to reduce the environmental impact of data centers. It also suggests approaches for greening the broader organization like computer sleep modes and telecommuting. Finally, it discusses how ITIL can help with green initiatives through aspects like service portfolio management, change management and asset management.