BT have released the 39 page report "The role of ICT in reducing carbon emissions in the EU" (May 2016). The report makes the bold claim that ICT has the potential to reduce EU carbon emissions 37% over 2012 levels by 2030. These savings would come primarily from manufacturing, energy industries and buildings. These are very bold claims and it is not clear from the report how these reductions are expected to occur.
Interestingly, along with the usual "smarts", such as Smart Buildings, Smart Energy and Smart Logistics, are "Smart Agriculture", e-learning, e-work and e-health.
In the course "ICT Sustainability" I teach students about how to estimate and reduce emissions using ICT. However, as the students soon realize, the hard part is not inventing a savings measure but motivating organizations and individuals to make the changes.