BMW invests in Prometheus Fuels, carbon-neutral petrol

German carmaker BMW and its sister brand Mini have invested $USD12.5 million into a US company that produces synthetic petrol and diesel made via carbon capturing. The venture capital arm of BMW and Mini, called BMW i Ventures, invested in a start-up called Prometheus Fuels, which claims it will be selling carbon-neutral fuel by the end of this year. While the technology to convert carbon emissions back into fuel was already available, the costs to do so were prohibitively expensive.