In a serendipitous coincidence with my post from Monday, Microsoft and climate science, KT announced today that Microsoft is committed to going carbon neutral in the next fiscal year:

[…] Beginning in fiscal year 2013 (which starts this July 1), Microsoft will be carbon neutral across all our direct operations including data centers, software development labs, air travel, and office buildings. We recognize that we are not the first company to commit to carbon neutrality, but we are hopeful that our decision will encourage other companies large and small to look at what they can do to address this important issue.
 
Cover of 'Becoming Carbon Neutral: How Microsoft is Becoming Lean, Green, and Accountable'. MicrosoftIn addition to our commitment to carbon neutrality, the part I’m most excited about is our plan to infuse carbon awareness into every part of our business around the world. To achieve this goal, we have created an accountability model which will make every Microsoft business unit responsible for the carbon they generate – creating incentives for greater efficiency, increased purchases of renewable energy, better data collection and reporting, and an overall reduction of our environmental impact.     
 
To put this into action, we’re creating a new, internal carbon fee within Microsoft, which will place a price on carbon. The price will be based on market pricing for renewable energy and carbon offsets, and will be applied to our operations in over 100 countries. The goal is to make our business divisions responsible for the cost of offsetting their own carbon emissions.
 
The carbon price and charge-back model is designed to provide an economic incentive for business groups across Microsoft to reduce carbon emissions through efficiency measures and increased use of renewable energy. Business operations impacted by the new carbon price include data centers, software development labs, office buildings, and business travel. For emissions not eliminated through efficiency measures, Microsoft will purchase renewable energy and carbon offsets. […]

This is music to the ears of a devoted climate science geek.