Cloud computing gives users much freedom on where they host their computation and storage. However the CO2\r\nemission of a job depends on the location and the energy efficiency of the data centers where it is run. We developed\r\na decision framework that determines to move computation with accompanying data from a local to a greener\r\nremote data center for lower CO2 emissions. The model underlying the framework accounts for the energy\r\nconsumption at the local and remote sites, as well as of networks among them. We showed that the type of network\r\nconnecting the two sites has a significant impact on the total CO2 emission. Furthermore, the task�s complexity is a\r\nfactor in deciding when and where to move computation.
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