Climate Footprint of CTL

What is the impact on the climate of different fuels?

The process of producing liquid fuels also burns fossil fuels, compounding greenhouse gas emissions. Several analyses have been done looking at the emissions of different fuels, the most comprehensive by the EPA. Recently the EPA has updated some of their analysis, which we have not yet incorporated into this plot. The Dept. of Energy (DOE) has contested the EPA's analysis of emissions from CTL if "Low Carbon Coal" (CCS) technology were used. Both numbers are plotted, and all the numerical data is below.

1. A) Original EPA analysis
2. B) DOE analysis of CTL with CCS
3. C) New analysis for renewables by EPA (not included in this data)

Some alternative fuels provide reduced emissions relative to conventional options, but CTL may not.

Fuel	Emissions relative to conventional	Source
Cellulosic Ethanol	9.1%	A
Biodiesel	32.3%	A
Compressed Natural Gas	71.5%	A
Natural Gas to Liquid	77.4%	A
Corn Ethanol	78.7%	A
CTL with CCS (EPA)	103.7%	A
CTL with CCS (DOE)	91%	B
CTL (EPA)	218.5%	A