The University Careers Service has information on "Working For More Than Profit". Their major event in this area is called The Works, which is held in Lent Term every year and provides information to students about alternative career and education opporunities in areas such as the charitable or environmental sector. For more information, check out the site for the last Works event which was held on Thursday 8 Feb 2007 (to view the site you first need to sign up at the careers website).
To see the type of organisations that come to the Works Careers Fair, take a look at the websites from previous works careers fairs:
Below are some links which might be of interest:
The Green Jobs Network of Websites
The Green Jobs Network of Websites consists of specialist job boards that are wholly dedicated to recruitment in the green sector. They are user-friendly websites offering registered candidates a highly flexible and easy to use interface. The websites are as follows;