How green is Facebook and Microsoft's push into cloud computing? That's the question posed this week by MediaShift editor and climate blogger Corbin Hiar in an online article that unpacks Greenpeace's ongoing debate with Facebook and the rest of the IT sector over its growing energy footprint and questionable energy choices.

Hiar talked with tech analysts, company representatives, and the Greenpeace Cool IT team to find out what companies like Facebook, Google, and Microsoft can do to ensure that their potential to create environmental benefit isn't overridden by their own CO2 emissions. 

Read the article: How Green is Facebook, Microsoft Push into Cloud Computing?