So this is beginning to make it's way around the blogosphere: From November 26 to December 27, a couple British guys trekked from the UK to Timbuktu in a truck powered entirely by biodiesel fuel made from chocolate waste (you know, the stuff that pollutes the chocolate river). The journey is estimated to have saved 15 tons of carbon emissions, making it the self-proclaimed "first carbon negative expedition." Additionally, Ecotec, a leading biodiesel producer and one of the trip's sponsors, donated a biodiesel production unit so that the local women in Mali can re-cycle their used cooking oil into biofuel.