Forbes: Can the biodiesel industry be saved? It’s remotely possible–but not unless the government steps in to jump-start the besieged market. Biodiesel, a low-carbon fuel usually made with soy, palm or canola oil, first grabbed the spotlight a few years ago. That was when Congress started promoting the green fuel as a replacement for traditional diesel. Private-equity firms started pumping hundreds of millions of dollars into companies like Seattle’s Imperium Renewables and Green Earth …