If companies don't like estimates by Greenpeace, perhaps they should reveal official numbers backed up by data. A single statement from Apple off-handedly spouting a number doesn't it make it any truer than Greenpeace estimating the cost. Sorry, I just don't believe unverified numbers from the likes of Apple.
Google's response: Urs Hoelzle Google’s Senior Vice President for Technical Infrastructure - "The company welcomed the Greenpeace report and believed that it would intensify the industry’s focus on renewable energy." Adding: "We’ve put a significant time and resources into making Google as energy efficient as possible, using renewable energy, and investing in the sector. We welcome reports like this, as they bring additional attention to these important issues for the industry.