Biodiesel took another hit on May 5, 2009, when the Environmental Protection Agency (EPA) announced that soy-based biodiesel won’t meet requirements for reducing greenhouse gas emissions. The 2007 energy law says biodiesel must reduce greenhouse gas emissions by 50 percent in comparison to conventional diesel. http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/trade12542/$FILE/us_biodiesel.pdf