In January, I wrote an article describing my pick of the year for 2006, which was Rentech, a coal-to-liquids technology company.

It is an American organisation that owns and licenses a proprietary and patented process that converts coal into valuable liquid hydrocarbons. In plain English, it takes biomass (coal, natural gas, woodchips etc) and turns it into gas. From the gas state it turns it into liquid fuel (hydrocarbon).