A previous study on the life cycle of fossil fuels in thermoelectric production identified the main weak points of coal, oil and gas in the combustion stage. The focus is now on the pre-combustion segment of natural gas and coal. The results show the extent of pre-combustion greenhouse gas emissions, their impact on the full life cycle and the high uncertainty of the estimate mainly related to the site-specificity of the sources of emissions in the pre-combustion segment and the methodology followed. In light of the environmental and economic implications of the Kyoto Agreements (and the global market for greenhouse gas permits), accurate emission accounting requires the adoption of standardised procedures and guidelines. Read more click.