I don't know anything about associations etc - maybe contact Business Link - they're probably know.
It's likely to include things such as:
Energy saving lightbulbs
Paper-less office
Low emission company cars
Water saving initiatives
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Carbon neutral web hosting may be another angle - <shameless plug> and maybe consider using an eco friendly printer if you outsource any printing for your clients </shameless plug>
Some great links, carbon offsetting is the way forward I reckon, thanks all
All I would say to this is be very careful, there are lots of less than ethical organisations that have created bandwagons so they can get their fill of this
Look for a credited scheme or at least a well known one. Many of the schemes are creating forests in parts of india, that are not sustainable, not environmentally friendly and in many cases do not help carbon offsetting but actually go against the very principle.
It is the way to go, but dont just pick the first one you find, do some research into it.