Google has a blog post with a Green Tour of the Google campus. Note: there data centers mentioned are not in this post, but I did learn today, Oct 15, 2009 is Blog Action Day for Climate Change.

A green tour of the Google campus

10/15/2009 05:00:00 AM

We care about a clean energy future and that's a commitment that starts at home. In honor ofBlog Action Day 2009 and this year's climate change theme, we wanted to walk you through some of the green features of our global headquarters here in sunny Mountain View, California.

Getting to work: We've got a shuttle service that brings employees from around the Bay Area to the Googleplex every day. These shuttles are outfitted with wi-fi and fueled by B20 biodiesel. And employees who bike, walk, skip, hop or otherwise self-power to work can earn points that translate into a donation from Google to their charity of choice.

Turning on the lights: The rooftops at our headquarters are covered in 9,212 photovoltaic solar panels that produce 1.6 MW of electricity — enough energy to power about 1,000 California homes.

Healthy buildings: The facilities at our main campus use sustainable building materials that are environmentally friendly and healthier, such as "cradle-to-cradle" certified products designed to never end up in landfills, fresh air ventilation, daylighting, and whenever possible, PVC- and formaldehyde-free materials.