Changes

* check the think tanks own website for what they say about who funds them (this is often in the "About Us" section or on the "Donate" page). Even if they only have a general statement about who funds them or the percentage from different corporate sectors etc, this is worth adding.;

* sometimes think tanks won't have their annual reports on their website. In which case, for U.S.-based think tanks, you can look up their annual returns to the Internal Revenue Service (IRS) at websites such as [http://www.guidestar.org Guidestar]. (You will need to register, which is free, and this will give you access to the last three IRS returns that have been submitted. IRS returns often provide only financial information but some material that can be particularly interesting is the list of office bearers, consultants and staff who were paid over $50,000 and disclosures on transactions with related entities).;p

* Even if there is nothing in any of the above sources, it is worth doing a search on the group at the [http://www.mediatransparency.org/searchtips.php Media Transparency website]. (Media Transparency information is based on the information provided by the foundations making the grants not by the groups receiving them, so this site can have useful historical material.);

* You can have a look at Exxon's own 2007 [http://www.sourcewatch.org/images/5/59/Exxon_Public_Policy_Contributions_2007.pdf disclosure statement] (pdf) on which think tanks they are currently funding. (you may also be interested in having a look at the disclosure statement of the power utility [[Xcel Energy]]'s as [http://www.xcelenergy.com/SiteCollectionDocuments/2007PoliticalContributionsReport.pdf well].;

* One other source that is worth having a look at is Greenpeace's [http://www.greenpeace.org/usa/campaigns/global-warming-and-energy/exxon-secrets ExxonSecrets]. (Though there are two things to note: 1) the site has not yet added data from Exxon's 2007 disclosure statement linked to above; and 1) Greenpeace's referencing style often has less information than we require so finding the exact source can sometimes take a little effort).; and