A few weeks ago, the IEA published a roadmap for biofuels in transportation. This argues that 27% of transport energy needs worldwide could be met with biofuels by 2050, saving a cumulative 20 billion tonnes (Gt) of carbon dioxide emissions over the next 40 years – all without affecting food security. The headline messaging for the report has been broadly represented (domesticfuel.com, thebioenergysite.com, thelowcvp.org.uk) as a call for continuation and expansion of existing biofuel mandates. By 2050, the roadmap assumes 32 exajoules of biofuel production, split 50:50 between crop-based and waste-based fuels, and that the crops will require 70 million hectares (Mha) of land to grow.
Kim and Dale in ‘Biomass and Bioenergy’ propose a no-iLUC conclusion by asserting that iLUC cannot have happened in any region where overall arable area is shrinking. Many in the field would dispute this interpretation.
Recent trends in specific CO2 emissions from new passenger cars registered in Europe highlight the significant difference that mandatory emissions performance standards can make.
Chart shows, for the United States, miles driven per capita each year versus gasoline prices.
GHG emissions, fuel economy and consumption, and standards.
The metrics of fuel consumption and greenhouse gas emissions have the advantage of being linear.