It turns out that emissions are growing and processing biofuels, some of significantly reducing their benefits, taking into account factors such as fertilizers made from fossil fuels.
He also increased by large sections of forest and grassland will be cut or burned to cultivate energy - and to grow food that has been driven by growing energy crops elsewhere - and thus free up additional stocks of carbon in the atmosphere.
Olivier De Schutter, Special Rapporteur on the Right to Food of the United Nations, is one of the experts who said the pressure on agricultural land demand for biofuels is an important factor in food prices have exacerbated the problems hunger and social development in some of the poorest countries over the past three years.
Anti-poverty groups such as ActionAid and Oxfam warned that demand for biofuels has led to land offers in Kenya, Senegal and Guatemala that people displaced or left without enough land to produce enough food to eat and earn a living.
This month, a committee of 19 influential scientists and academics who are described still another concern: that the authorities, including the European Union, had obtained their evil and mathematics were overestimating the potential of bioenergy reducing greenhouse gas emissions.
The Scientific Committee of the European Environment Agency said the union had committed a "serious accounting error" by not measuring the amount of additional carbon dioxide was absorbed by existing fields, forests and grasslands as compared to that absorbed by the energy crops.
"Possible consequences of bio-energy are huge accounting error," the committee wrote.
The committee concluded that the Union was effectively "double counting" of reductions in emissions of greenhouse gases and warned that current policies of bioenergy "can even lead to increased carbon emissions -. Accelerating global warming"
The declaration has the cold response to the European Commission, which monitors policy on renewable energy.
Marlene Holzner, spokesman for EU Energy Commissioner Günther Oettinger said parts of the opinion was based on the work that had been "rejected by other institutions in the past." It also suggests that the statement failed to make a correct comparison of biofuels and gasoline or diesel.
Bioenergy has become one of the closest in Brussels since the EU governments agreed three years ago that 20 percent of all energy and 10 percent of transport fuels should come from renewable sources before the end of the decade.
Bioenergy, including wood burning to generate electricity, will meet about half of the overall target for renewable energy in national plans, while biofuels offer the most renewable fuels.
Powerful interests are at stake, such as farmers and biodiesel producers in Germany and France rapeseed and palm oil producers in Malaysia and Indonesia. Biofuels are already providing about 4 percent of transportation fuels in Europe, with sales of $ 17 million a year.
There is a need to "protect the legitimate expectations of European agriculture" and "avoid problems with major trading partners of the Union," according to minutes of a meeting in July in which a number of European Commissioners discussed biofuels.
The Commissioners also discussed the wait up to seven years to punish the farmers for fuel the largest impact on dietary changes and land use, such as the clearing of rainforests and peatland drainage.
Department officials in EU climate continue to press for these measures come into force within three years and additional measures to limit fuel on the basis of a few palm oil and soybeans to enter into force once as possible.
Still, concerns are growing that the Commission has been too quick to ignore the evidence that their policies encourage certain forms of harmful bio-energy.
ClientEarth, a law firm, non-profit with offices in Brussels, filed a complaint against the European Commission on three occasions since last year for access to information on the environmental effects of biofuels and how the fuels are certified.
Customer of the Earth, said he expected the Court, the EU's second highest court to set hearing dates for two cases, and that the initial response of the Commission for the third case.
Last week, environmental groups, including BirdLife International, the European Environment, Transport and Environment, Wetlands International and Greenpeace sent a letter to José Manuel Barroso, President of the Commission, seeking assurance that his organization was "taking due regard to science in energy policy, after several cases in which rejected the best available science. "
The groups expressed particular concern that some of the results of 19 researchers and academics in the field of bioenergy had been "refuted without cause." Aid to Mr Barroso said Friday that the answer was prepared.
Even some sectors are becoming increasingly frustrated that Europe is looking for more of their energy from plants.
The European Group of the Federation, an industry group that represents manufacturers of wood panels, including subsidiaries of Ikea, the Swedish furniture giant, welcomed the findings of 19 scientists and academics.
Ladislav Dory, president of the Federation, said that demand in the form of wood chips and sawdust from sawmills were among the clouds, because it was too easy for utilities to calculate the combustion of wood pellets to reduce emissions greenhouse gases.
Mr. Dory said that a number of European leaders on panel was already out of the market and that EU authorities are required to change their rules on bioenergy.
The accounting error "is very serious," he said.
"We have a crazy situation, that there are financial incentives available to burn one of the main raw materials at the expense of the environment and the economy," he said.
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