Much of Dell's physical plant is near Round Rock, but last time I looked their official corporate offices were in Austin. And Dell has gone green:

The chairman of Dell today challenged the P-C industry to adopt free recycling programs for customers. Michael Dell also announced that his Round Rock-based company will offer to plant a tree for every personal computer sold.

Dell was a keynote speaker at the International Consumer Electronics Show in Las Vegas.

Dell in 2004 began offering free recycling of any brand of computer or printer if consumers bought a new Dell system.

The policy was revised in June so consumers can recycle all Dell-branded printers, personal computers or other electronics gear for free -- no purchase of new Dell gear required.

Michael Dell challenges PC industry to go green, KTEN Local News, 9 Jan 2007

(I would have quoted from the Austin American-Statesman but for their annoying registration, which currently claims I'm not who I say I am.)

Dell has its own flashy web pages on this subject.

Treehugger provides a bit more context:

Aligning economics and environmental interests is the only way we’ll see real change in the battle against climate change. That’s my opinion and thankfully I’m not alone in this line of thinking. Today, January 9, 2007, Dell joined forces with the Carbonfund.org and The Conservation Fund to launch the ‘Plant a Tree for Me’ initiative.

Michael Dell explained in a press conference today that he sees the initiative as a way to partner with customers and together help make computer use carbon neutral. From now on customers will be given an opportunity to make a donation that represents a carbon offset of their product use. Planting trees has the added bonus of contributing to reforestation and habitat reconstruction.

Dell + The Conservation Fund + Carbonfund.org = Plant A Tree For Me by Celine Ruben-Salama, New York, NY, 9 January 2007 Business & Politics (news)

Follow the linkfor some calculations of how much CO2 needs to be dealt with per computer.

Dell making carbon offsets easy for their customers seems worldchanging to me.

-jsq