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They say they are using 260 MW from renewable energy, so far. I wonder how much they need to meet their carbon neutrality goal.

Here we go: "We're currently using renewable energy to power over 30% of our operations..."

So they need ~867 MW to be neutral, depending on how outdated this page is: http://www.google.com/green/energy/.

I commend their efforts.

At least didn't just resort to buying offshore offset credits right?

They do buy offsets, which are reputed to be higher quality than the BS you can add to your Dell shopping cart or whatever.