Trillium Asset Management..., a shareholder in Warren’s Buffet’s Berkshire Hathaway Corporation, is joining two nonprofit advocacy organizations, the International Labor Rights Forum...and International Rivers..., in calling on fellow Berkshire Hathaway investors to back a proposal on the agenda for the company’s upcoming May 2, 2009 annual meeting which requests that Berkshire prepare a “Sustainability Report” on its performance on environmental and social issues... [A] report recently issued by leading shareholder advisory firm PROXY Governance...[called] Berkshire’s disclosure of environmental and social issues affecting its portfolio “relatively poor,” and concluding that “additional disclosure in this area would help shareholders.” [also refers to PacifiCorp, Russell Athletic (both part of Berkshire Hathaway); PetroChina]