Climate Control

The report argues that California can significantly reduce its global warming impact by mandating the adoption of existing and near-term vehicle technologies. Modeling shows that currently available improvements in engines, transmissions, and air conditioning could reduce fleet average heat-trapping emissions by 20%, while advanced technologies available within five years could achieve a 40% reduction. These improvements are presented as cost-effective, with fuel savings offsetting initial costs within a few years, and would provide a model for other U.S. states and Canada.

• Mobile sources, specifically passenger vehicles, are the primary contributor to global warming pollution in California, accounting for approximately 50% of the state's heat-trapping emissions inventory.
• Implementing currently available technologies—such as variable valve lift and timing, continuously variable transmissions, and cylinder deactivation—could reduce fleet average heat-trapping emissions for new vehicles in California by 20%.
• Advanced technologies expected to be available for fleetwide use within five years, including stoichiometric direct-injection engines, automated manual transmissions, and 42V integrated starter-generators, could deliver a 40% reduction in fleet average heat-trapping emissions when combined with current technologies.
• The financial cost of these vehicle improvements is offset by reduced operating costs for consumers; a 20% emission reduction would save California drivers over $2 billion, while a 40% reduction could save more than $4 billion over the life of the vehicles.
• California's regulatory influence is significant because it represents over 10% of new U.S. vehicle sales, and its standards are already adopted by other states, meaning current California-compliant vehicles account for about 25% of new U.S. sales.
• Alternative fuels offer long-term reduction potential, with renewably produced hydrogen and biomass-based ethanol identified as crucial for significant reductions, whereas corn-based ethanol and non-North American CNG provide limited benefits.
• The report's sensitivity analysis indicates that while the growth of light trucks and increased vehicle performance (horsepower) can negatively impact emission reductions, the potential for significant reductions remains even in worst-case scenarios (16% for today's technology and 36% for advanced technology).

APA

Bedsworth, L. W. (2004). Climate Control. Union of Concerned Scientists. https://www.ucs.org/sites/default/files/2019-09/climate_control_-lo-res.pdf

Chicago

Bedsworth, Louise Wells. Climate Control. Union of Concerned Scientists, 2004. https://www.ucs.org/sites/default/files/2019-09/climate_control_-lo-res.pdf.

Wikipedia

{{cite report |last1=Bedsworth |first1=Louise Wells |title=Climate Control |publisher=Union of Concerned Scientists |date=April 2004 |url=https://www.ucs.org/sites/default/files/2019-09/climate_control_-lo-res.pdf |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{bedsworth2004climate, author = {Bedsworth, Louise Wells}, title = {{Climate Control}}, institution = {Union of Concerned Scientists}, year = {2004}, month = apr, url = {https://www.ucs.org/sites/default/files/2019-09/climate_control_-lo-res.pdf}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }