The U.S Chamber of Commerce is the world’s largest not-for-profit commercial federation, representing some 3 million businesses. But it no longer represents Apple Inc. AAPL .
On Monday, Apple resigned from the Chamber “effective immediately” over the organization’s opposition to the Obama administration’s environmental policies.
In recent weeks, Apple has made a concerted effort to reposition itself as environmental leader. Steve Jobs even gave BusinessWeek a rare interview to push his green agenda.