Read here. Biofuels produced from palm oil trees, rapeseed and soybeans produce more greenhouse emissions than petroleum diesel fuel. Why? When all the cradle-to-grave factors are assessed for fuel types, including indirect and direct land use, crop/plantation agriculture production, material processing and manufacture, distribution, use, repair and maintenance, and disposal and/or recycling, the total greenhouse emissions (not just CO2) for these type of biofuels exceed equivalent crude oil derivatives.
Unfortunately, politicians and policymakers worldwide foolishly provided incentives to wealthy investors (Soros, Gore and etc.) for a quick, large increase of biofuel production without waiting for the necessary scientific due diligence the public would naturally expect. As a result, global greenhouse emissions have not only increased needlessly because of this stupidity by elites, but invaluable, irreplaceable, pristine tropical forests were destroyed to make room for growing the gas emitting biofuel crops.
"The University of Amsterdam researcher reports that with respect to obtaining palm oil from trees planted on recently deforested soil in Southeast Asia, soybean oil from crops planted on recently deforested soil in Brazil, and rapeseed oil from crops planted on existing arable soil in Europe, it has been found that "the greenhouse gas emissions associated with the life cycle of the oils considered are larger than the corresponding emissions associated with conventional fossil fuel-based diesel."...And he further reminds us that when there is a rapid expansion of oil crop production on existing arable soils, much of the shortfall in food and feed production "has to be met by expansion of agricultural land elsewhere,".....also notes that in the case of palm oil, the time required to pay back the subsequent "carbon debt" is probably on the order of 60-100 years "when oil palms are cultivated on mineral soils after recent deforestation and on the order of more than one century to over nine centuries, when the oil palms are cultivated on peat." And when soybeans are cultivated for oil on recently deforested land, he says that "the carbon payback time is in excess of 300 years."" [Lucas Reijnders 2011: Renewable Energy]