What about having your web site powered by solar....AISO (http://www.aiso.net) is 100% solar powered, both their servers and data center are powered by onsite solar panels. And they also have a partnership with Co-Op America, the U.S. Environmental Protection Agency, and the U.S. Green Building Council. Plus, they are doing more then just making sure their electricity is green. Their data center and office is green too by using environmentally friendly air conditioners, solar tubes to bring in natural light, a propane powered generator instead of diesel, VMWare virtualization to reduce their server electricity usage, 6 watt energy saving desktops computers for their employees, and soon to be LEED certified as a green data center, the only public one in North America, at least that I have found so far. So as far as the environmental concern, I think AISO is more concerned about the environment then any other of its competitors will ever be.