The greenhouse gas emissions of biofuels have been under discussion for years. Now studies commissioned by the European Union are putting pressure on biodiesel in particular.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/green-carbon-footprint
[2] http://admin.indiaenvironmentportal.org.in/category/author/karsten-wiedemann
[3] http://admin.indiaenvironmentportal.org.in/category/journal/new-energy
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/biofuel
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/biodiesel
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/green-house-gases
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/european-union-eu
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/renewable-energy
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bio-fuel-crops
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ethanol
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/land-use
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/parliament