How are global biofuels trends changing?

At the end of 2011, the United States overtook Brazil as the world\u27s top ethanol exporter— though U.S. imports from Brazil have been growing as a result of domestic regulation in the United States. Countries like Thailand have also increased their ethanol exports to traditional Brazilian markets, such as China, as the South American nation struggles to meet domestic demand. What trends in the global biofuel market, including advanced biofuels and bio-based products, will be seen in the medium- to longterm future? How are Brazil\u27s biofuels production trends and government policies for the sector changing, if at all? What accounts for the two-way ethanol trade between the United States and Brazil