US scientists reported on Wednesday that approximately 74 percent of the oil from the BP spill in the Gulf of Mexico has been removed, with 26 percent remaining either as a sheen or tarballs, buried in sediment, or washed ashore. According to the report "BP Deepwater Horizon Oil Budget : What Happened to the Oil?", one quarter of the oil released was removed through burning, skimming, and direct recovery from the wellhead. Another 25 percent evaporated or dissolved, while 24 percent was dispersed into small droplets. The remaining oil is on or just beneath the water's surface, washed ashore, or buried in sand and sediments at the sea bottom. The Unified Command, made up of government and private efforts, has handled 33 percent of the oil spill. The report discovered that oil was collected from the wellhead through various methods such as riser pipe insertion tube and top hat systems (17 percent), burning (5 percent), skimming (3 percent), and chemical dispersion (8 percent). The remaining 74 percent was naturally removed. Carol Browner, energy and climate change adviser to President Barack Obama, stated on ABC's "Good Morning America" that the majority of the oil seems to have disappeared according to scientists' initial assessment. She also expressed that this is a significant milestone.