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Carbon accounting policies for biofuels

In a recent post. Not all biofuels, however, have the same carbon footprint. How can biofuels for transport and their life-cycle greenhouse gas emissions then be effectively regulated?
As pointed out in the corresponding paper are insufficient for not accounting for a series of general equilibrium effects. The European Commission, in fact, is currently reviewing its stance, and may review the FQD in this summer. But what kind of measure can improve the biofuel conundrum?
The twin paper by Flachsland et al. studies a potential role of emission trading also for the transport sector. Now, this is an effective measure in terms of bringing a level-playing field across all fuels. In fact, if a cap is global in scope, and covers all relevant sectors, we could sleep quietly: wherever emissions appear they will be accounted for, and it is not relevant whether they are induced by biofuels or not. It matters only that they get a price tag, and that people try to reduce emissions.
However, a global cap is not in sight, and an inclusion of agricultural emissions also seems utopian currently. Hence, we are still stuck with the GHG accounting problem for biofuels (and potentially relevant general equilibrium effects for other fuels such as electricity) when transport is included in the European Emission Trading Scheme.
One possibility is to treat biofuels by default as having at least gasoline-equivalent emissions (see DeCicco, 2009 and processing emissions, gaining credits if certified. This would reverse the burden of proof. Properly implemented, it can be seen as an implemented precautionary principle – better safe the forests and its carbon stock then being sorry big time.

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