(Cross-posted from the Official Google Blog, the Gmail Blog, and the Google Green Blog.)

Cloud computing is secure, simple, keeps you productive and saves you money. But the cloud can also save energy. A recent report by the Carbon Disclosure Project (CDP) and Verdantix estimates that cloud computing has the potential to reduce global carbon emissions by millions of metric tons. And Jonathan Koomey, a consulting professor at Stanford who has led several studies on data center energy use, has written that for many enterprises, the cloud “is significantly more energy efficient than using in-house data centers.”

Because we’re committed to sustainability, we sharpened our pencils and looked at our own services to see how they stack up against the alternatives.

We compared Gmail to the traditional enterprise email solutions it’s replaced for more than 4 million businesses. The results were clear: switching to Gmail can be almost 80 times more energy efficient (PDF) than running in-house email. This is because cloud-based services are typically housed in highly efficient data centers that operate at higher server utilization rates and use hardware and software that’s built specifically for the services they provide—conditions that small businesses are rarely able to create on their own.


If you’re more of a romantic than a businessperson, think of it this way: It takes more energy to send a message in a bottle than it does to use Gmail for a year, as long as you count (PDF) the energy used to make the bottle and the wine you drank.

We ran a similar calculation for YouTube and the results are even more striking: the servers needed to play one minute of YouTube consume about 0.0002 kWh of energy. To put that in perspective, it takes about eight seconds for the human body to burn off that same amount. You’d have to watch YouTube for three straight days for our servers to consume the amount of energy required to manufacture, package and ship a single DVD.

In calculating these numbers, we included the energy used by all the Google infrastructure supporting Gmail and YouTube. Of course, your own laptop or phone also consumes energy while you’re accessing Google, so it’s important to choose an efficient model.

There’s still a lot to learn about the global impacts of cloud computing, but one thing we can say with certainty: bit for bit, email for email, and video for video, it’s more efficient in the cloud.

From the Google Cloud Connect menu, click Open from Google Docs…


This will bring up a dialog listing all the documents that can be opened with the application you are using. For example, if you are working in Microsoft PowerPoint, you will see a list of all the Microsoft PowerPoint files available in Google Docs. You can then select the file you want to download and open.


If you have a lot of files stored in Google Docs, use search to find the file you are looking for. After selecting a file to open, the file will be downloaded to your computer and opened automatically.

When you want to open the file again, you’ll be able to open it from the folder you downloaded the file into. Now you can collaborate, share and access revision history on that file in Microsoft Office.

As always, please send us your feedback and thoughts.