  The ICT (Information Communication Technologies) ecosystem is estimated to be
responsible, as of today, for 10% of the total worldwide energy demand -
equivalent to the combined energy production of Germany and Japan. Cloud
storage, mainly operated through large and densely-packed data centers,
constitutes a non-negligible part of it. However, since the cloud is a
fast-inflating market and the energy-efficiency of data centers is mostly an
insensitive issue for the collectivity, its carbon footprint shows no signs of
slowing down. In this paper, we analyze a novel paradigm for cloud storage
(implemented by Cubbit, http://cubbit.io), in which data are stored and
distributed over a network of p2p-interacting ARM-based single-board devices.
We compare Cubbit's distributed cloud to the traditional centralized solution
in terms of environmental footprint and energy efficiency. We demonstrate that,
compared to the centralized cloud, the distributed architecture of Cubbit has a
carbon footprint reduced of a 77% factor for data storage and of a 50% factor
for data transfers. These results provide an example of how a radical paradigm
shift in a large-reach technology can benefit both the final consumer as well
as our society as a whole.
