This website (as well as all of the sites that I design and operate) is carbon-neutral.
Dreamhost, the hosting company that I use, make efforts to reduce their own carbon footprint and purchases Renewable Energy Credits to make up for the energy they cannot obtain greenly.
Dreamhost say: "Putting a price on carbon output is just one way to help make the world a better place. It’s a first step towards true energy sustainability. Organizations large and small are constantly working on reducing their environmental emissions. When they do so a neutral third party then steps in to verify the reduction and issues what are known as “Renewable Energy Credits”."
We’ve purchased enough of these credits – which are retired after purchase and not resellable – to account for our energy usage. The proceeds of these credit purchases are then put toward funding further emission reduction and renewable energy projects. We are not currently able to actually power our servers with the wind or the sun, but this is the next best thing! Our Renewable Energy Credits (RECs) have been certified by Green-e.
You can check the green status of this website here