Green Hosting

I recently read No Impact Man, a story of one guy who decides to trial a year of living without impact. And, as you may know 

Electricity generation using carbon based fuels is responsible for a large fraction of carbon dioxide (CO2) emissions worldwide; and for 41% of U.S. man-made carbon dioxide emissions. Source: wikipedia

so I was very pleased to note that the host of UI&us, Squarespace, has an extensive Green statement. Overall a very environmentally responsible company, based on this. I'd love to know what you guys think of their claims.