Buffett invested in PetroChina Company Limited and in a rare move, posted a commentary on Berkshire Hathaway's website stating why he would not divest over its connection with the Sudanese civil war that caused Harvard to divest. He sold this stake soon afterwards, sparing him the billions of dollars he would have lost had he held on to the company in the midst of the steep drop in oil prices beginning in the summer of 2008.