In Sweden this past week, Volvo representatives proudly displayed the company's lineup of carbon-neutral trucks. The words Volvo uses to describe the line-up are "carbon free," but emissions still come out the tailpipe. The biomass components of the fuels make the net result carbon neutral, Volvo materials admit beneath the "carbon free" headline.

Volvo exhibited trucks with 9-litre engines running on seven types of alternative fuels. You can read details after the jump, but the types are as follows: biodiesel, biogas, biogas + biodiesel, dimethyl ether (DME), ethanol/methanol, synthetic diesel, and hydrogen gas + biogas.

A member of Volvo Group Management and senior vice president, public and environmental affairs, Jan-Eric Sundgren, explained in a release why the company is so interested in alternative fuel diversity: "We know that in the foreseeable future there will be insufficient biomass or renewable fuels to fully replace fossil fuels. That is why it is important that decisions on the production of future fuels are preceded by such comprehensive assessments – otherwise there is the risk that we focus on too many and quite simply unsuitable alternatives, which will delay the introduction of carbon dioxide-free transport."

[Source: Volvo]