... perhaps: Rapeseed biofuel ‘produces more greenhouse gas than oil or petrol’.
"The concerns were raised over the levels of emissions of nitrous oxide, which is 296 times more powerful as a greenhouse gas than carbon dioxide. Scientists found that the use of biofuels released twice as much as nitrous oxide as previously realised."
Nitrous oxide is laughing gas. Maybe if enough of it gets into the atmosphere, we'll all start having a brighter outlook.