Currently, half of all our domestic refinery capacity is concentrated in the Gulf States, a region too vulnerable to natural disasters.  That in turn puts the U.S. energy security at risk and causes periodic supply disruptions and price increases. Simply expanding our current refineries fails to address this concentration and indeed makes it worse.  Moreover, such expansion only increases our over reliance on crude oil as a feedstock.  Constructing new refineries in other regions provides needed geographic distribution and also creates the opportunity to utilize locally available biomass and other renewable fuel feedstocks.  Our agricultural and forestry resources are currently sufficient to sustainably displace more than one third of our transportation fuel needs, and we should support domestic supply over protecting the import-dependent status quo.