Don’t forget – where your cloud apps are hosted helps determine their carbon footprint

Back in July of this year (2011), the Carbon Disclosure Project (CDP), in conjunction with Verdantix, released a report titled Cloud Computing – The IT Solution for the 21st Century [PDF warning] which erroneously claims Cloud Computing is Green. Shortly after it was released, I wrote a long post outlining exactly where the report was flawed. I also contacted the CDP directly outlining my concerns to them and pointing them to the blog post.

Then, a couple of weeks back, when preparing my slides for my Cloud Computing’s Green Potential talk for the Cepis and Hepis Green IT conference in Athens, I discovered that Verdantix and the CDP had published

a new report [PDF] on the business and environmental benefits of cloud computing in France and the UK

Unfortunately, not only does the new report make the same mistakes as the original one, but it further compounds those errors with an even more fundamental one.

Let me explain.

In the key assumptions section of the report it talks about the metric tons of CO2/kWh in both the UK and French electricity grids (0.000521 tonnes and 0.000088 tonnes respectively). It uses these figures to extrapolate the savings in both France and the UK for companies migrating their applications to cloud computing.

So? You say. Sounds reasonable to me.

Well, the issue is that they didn’t do any work to identify where applications migrated to the cloud would be hosted. The implication being that UK applications migrated to the cloud, will be hosted on UK cloud infrastructure and French IT applications will be migrated to French hosted cloud infrastructure. In fact this would be a highly unusual scenario.

A quick look at where most cloud hosting takes place shows that the vast majority of it is occurring in the US, with quite a lot happening in Singapore with a lesser amount in Europe (and that split between Ireland, Germany, UK, etc. but almost none in France – Ireland is underestimated in the list as it doesn’t include Microsoft which has a significant Cloud hosting facility in Dublin which it is now expanding or Google’s Dublin facility)…