When we think about climate change, the main sources of
carbon emissions that come to mind for most of us are heavy industries like petroleum, mining and transportation.
Rarely do we point the finger at computer technologies.
In fact,
many experts view the
cyber-world of information and computer technologies (ICT) as our
potential saviour, replacing many of our physical activities with a
lower-carbon virtual alternative.
That is not what our study, recently published in the
Journal of Cleaner Production, suggests.
Having conducted a meticulous and fairly exhaustive inventory of the
contribution of ICT —including devices like PCs, laptops, monitors,
smartphones and tablets — and infrastructure like data centres and
communication networks, we found that the relative contribution of ICT
to the total global footprint is expected to grow from about one per
cent in 2007 to 3.5 per cent by 2020 and reaching 14 per cent by 2040.
That’s more than half the relative contribution of the
entire transportation sector worldwide.
Another disconcerting finding is that all this extraordinary growth
is mostly incremental, essentially shattering the hope that ICT will
help reduce the global carbon footprint by substituting physical
activities with their virtual counterparts.
The impact of smartphones
Perhaps the most surprising result of our study was the
disproportionate contribution of smartphones relative to the overall ICT
footprint.
We found that the relative emissions share of smartphones is expected
to grow from four per cent in 2010 to 11 per cent by 2020, dwarfing the
individual contributions of PCs, laptops and computer displays.
In absolute values, emissions caused by smartphones will jump from 17
to 125 megatons of CO2 equivalent per year (Mt-CO2e/yr) in that time
span, or a 730 per cent growth.
The lion’s share of this footprint (85 to 95 per cent) will be caused
not by the use of the device, but rather by its production. That
includes, in addition to the manufacturing energy, the energy for
material mining
for gold and the so-called rare-earth elements like yttrium, lanthanium
and several others that today are almost exclusively available only
from China.
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Want to help combat climate change? Stop replacing your phone every two years. (Shutterstock) |
Another guilty participant in this excessive carbon footprint are the
phone plans that encourage users to get a new smartphone every two
years. That accelerates the rate at which older models become obsolete
and leads to an extraordinary and unnecessary amount of waste.
These findings pertain to the device side.
Every text, download, email uses server energy
On the infrastructure side, we predict the combined footprint of data
centres and communications networks will grow from 215 megatons of C02
equivalent a year (Mt-CO2e/yr) in 2007 to 764 MtCO2-e/yr by 2020, with
data centres accounting for about two thirds of the total contribution.
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Data centres are an increasing source of carbon emissions. (Shutterstock) |
For comparison purposes, the entire carbon footprint of Canada was
about 730 MtCO2-e in 2016 and is expected to decrease by 2020.
The growth in smartphones and data centres aren’t unrelated.
Indeed, it’s the dizzying growth in mobile communications that’s
largely driving the pace for data centres. For every text message, video
download, photo exchange, email or chat, there’s a 24/7 power-hungry
server in some data centre that’s making it happen.
It’s the energy consumption that we don’t see.
Software companies spur growth
Finally, and perhaps the most ironic aspect of all this, is that it’s
software that is driving the overall growth in ICT as a whole, devices
and infrastructure included.
Software companies like Google, Facebook, Amazon, Microsoft and Yahoo
boast some of the largest data centres in the world. The rise in
dominance of the mobile operating systems, namely Apple’s iOS and
Google’s Android, along with the millions of mobile applications that
are built on top of those platforms, has spawned the mobile
communication age.
The incredible —as well as unsustainable— growth in the emission
footprint of all this hardware is there for only one purpose: To support
and serve the software universe.
In other words, while it’s the hardware that does all the dirty work, it’s the software that’s calling all the shots.
The way out?
At the societal level, we must demand that all data centres run exclusively on renewable energy.
At the individual level: Hold on to your smartphone for as long as
you can, and when you do upgrade, make sure you recycle your old one.
Sadly, only
one per cent of smartphones are being recycled today.
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