Cloud computing relies on sharing of resources to achieve coherence and economies of scale similar to a utility (like the electricity grid) over a network.
At the foundation of cloud computing is the broader concept of converged infrastructure and shared services.
The cloud also focuses on maximizing the effectiveness of the shared resources. Cloud resources are usually not only shared by multiple users but as well as dynamically re-allocated as per demand. This can work for allocating resources to users in different time zones.
For example, a cloud computer facility which serves European users during European business hours with a specific application (eg. email) while the same resources are getting reallocated and serve North American users during North America’s business hours with another application (eg. web server). This approach should maximize the use of computing powers thus reducing environmental damage as well, since less power, air conditioning, rackspace, and so on, is required for the same functions.