In this paper I discuss general conceptual issues in the estimation of the impacts of CO2 emissions from soils and biomass, over time, as a result of land-use change (LUC) due to increased demand for energy crops. The effect of LUC on climate depends generally on the magnitude and timing of...

Every year, federal, state, and local governments in the U. S. spend tens of billions of dollars to build and maintain roads, enforce traffic laws, put out motor-vehicle fires, lock up motor-vehicle criminals, control motor-vehicle pollution, research new motor fuels and motor-vehicle...

Human activities associated with the production and use of energy and materials can pollute the air and water. Since the late 1960s concern about regional and local air pollution has led to the adoption of environmental laws and regulations regarding major polluting human activities, such as...

General. This report provide an overview of basic assumptions and general results for all of the fuel, feedstock, and light-duty vehicle combinations treated in the LEM, and somewhat more detailed results and discussions for the longer-term advanced options, including compressed or liquefied...

This manuscript on lifecycle analysis (LCA) of biofuels for transportation has three major parts: * I. An analysis of greenhouse-gas emissions from biofuels, estimated using the Lifecycle Emissions Model (LEM). * II. A review of recent LCAs of biofuels. * III. A comprehensive conceptual...

Various alternative fuels and vehicles have been proposed to address transportation related environmental and energy issues such as air pollution, climate change and energy security. Hydrogen fuel cell vehicles (FCVs) are widely seen as an attractive long term option, having zero tailpipe...

General. This report provide an overview of basic assumptions and general results for all of the fuel, feedstock, and light-duty vehicle combinations treated in the LEM, and somewhat more detailed results and discussions for the longer-term advanced options, including compressed or liquefied...

In this paper I discuss general conceptual issues in the estimation of the impacts of CO2 emissions from soils and biomass, over time, as a result of land-use change (LUC) due to increased demand for energy crops. The effect of LUC on climate depends generally on the magnitude and timing of...

Urban regions worldwide are dominated by the need to provide for large numbers of high-speed, high-mass vehicles. Current strategies result in congestion, social fragmentation, and environmental degradation. An alternative urban design is presented that incorporates two separate road systems:...