In their words:
“SustainableWebsites.com is a project of SustainableMarketing.com – a community of green businesses using the power of network effects to promote their businesses. The more green businesses that host with us, the better the network becomes, and the more opportunities grow for all of us!”
SustainableWebsites offsets their energy use with wind power. They also have a strong back end of sustainability through their other work as a collaborative of green businesses. They offer WordPress, Drupal and Joomla hosting which is always a nice bonus. Plus you know their background in e-marketing will be helpful.
A small company is the best kind to work with as a customer so I would not hesitate to recommend checking them out.