ICT can enable reductions in carbon emissions and energy use in other sectors like transport, industry, buildings, and power. Examples include teleworking to reduce transportation, smart grids to optimize power generation and distribution, and energy monitoring in buildings. However, the greenhouse gas reductions enabled by ICT will be claimed by the sectors that achieve them, not by ICT. Still, ICT presents market opportunities in energy services like wind power forecasting, green data centers, and detecting land suitable for sustainable biofuels. Innovation in ICT can both help lower carbon economies and create business opportunities.