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The report analyzes the relationship between rising temperatures and ground-level ozone formation, projecting that climate change will increase ozone concentrations and exacerbate respiratory health issues. Using the EPA's BenMAP model, the authors estimate that by 2020, the 'climate penalty' could result in 2.8 million additional acute respiratory symptoms and $5.4 billion in health costs. By 2050, these impacts are projected to rise significantly, with 11.8 million additional respiratory symptom occurrences. The report emphasizes that while precursor emissions are declining, warming temperatures may offset these gains, particularly in California, the Midwest, and the Mid-Atlantic.

The document details the severe health risks of diesel particulate matter, including 21,000 annual deaths and increased cancer risks. It advocates for the Diesel Emission Reduction Act (DERA) to clean up the existing fleet of 11 million heavy-duty engines and proposes the Clean Construction Act of 2011 to integrate emission controls into federally funded transportation projects, capping costs at 1% of project totals.

The report outlines a pathway for Seattle to reach net zero greenhouse gas emissions by 2050. By implementing aggressive strategies across transportation, buildings, and waste, the city could reduce per capita core emissions by 91% relative to 2008 levels. Key drivers include a massive shift toward electric vehicles, deep energy efficiency retrofits in the built environment, and a transition to low-carbon energy sources like biomass-fired district energy. While the scenario achieves a 90% reduction in core emissions, the report notes that the final 10% may require offsets or sequestration.

The document concludes that a federal US carbon market is unrealistic for the foreseeable future, but identifies potential for linking the EU ETS with regional systems like the Western Climate Initiative (WCI) and California. It highlights that while the Regional Greenhouse Gas Initiative (RGGI) is operational, its low prices make it an unattractive linking partner. The authors argue that a bottom-up climate architecture, rather than a single global carbon market, is the most likely trajectory for international climate cooperation.

The report documents the presence of hexavalent chromium, a known carcinogen, in leachate from coal ash disposal sites and groundwater across the United States. It highlights a discrepancy between the EPA's recognition of the chemical's toxicity in drinking water and its failure to account for ingestion risks in its coal ash risk assessments. The document provides evidence from EPA, DOE, and EPRI studies showing that chromium leaching from coal ash is nearly 100% hexavalent and often exceeds safety standards by thousands of times. It concludes that the EPA must designate coal ash as a hazardous waste under the Resource Conservation and Recovery Act to protect public health.

The Global Ecology Center (GEC) at Stanford University is an 11,000-square-foot laboratory building designed using RMI's '10xE' whole-system thinking. By challenging conventional design assumptions and employing an interdisciplinary process, the project achieved a 72 percent reduction in electricity for HVAC and lighting compared to a 2001 California Title 24-compliant building. Key innovations include a night-sky cooling system that uses roof sprays to chill water, radiant floor cooling, and a 'cascading' ventilation system that reduces outside air needs by 20 percent. The building also reduced its concrete carbon footprint by 31 percent through the use of high-volume fly-ash concrete and decreased water usage by 33 percent. Despite challenges with standard energy-modeling software and some valve leaks, the GEC demonstrated that high efficiency can be achieved with a modest capital cost premium, resulting in operating costs approximately 56 percent lower than a comparable existing building.

The report examines the 'water-energy nexus' in the western United States, specifically the eleven states of the Western Electric Coordinating Council (WECC). It models eight scenarios from 2008 to 2100, varying by carbon emission goals, water conservation mandates, and energy efficiency levels. The primary finding is that while power plants require water, their total consumption is small compared to agricultural and urban use, making the water-energy nexus a secondary concern in the region's broader water crisis. The analysis suggests that carbon pricing (around $70 per ton) is a more likely driver for shifting energy strategies than water pricing, as water prices would need to exceed $4,000 to $7,000 per acre-foot to make water-conserving energy scenarios the least-cost option.

The U.S. Southwest is currently relying on unsustainable groundwater extraction to meet water demands. Climate change is projected to exacerbate this crisis by increasing agricultural water needs and shifting snowmelt timing, leading to significant water shortfalls. The report finds that without adaptation, the region faces a cumulative water shortfall of up to 2,253 million acre feet over the next century under a severe climate scenario (A2). While desalination and imports are deemed non-viable due to cost and availability, planned reductions in urban and agricultural water use—particularly the elimination of low-value crops—could bring water use to sustainable levels. The economic cost of inaction is estimated between $2.3 trillion and $5 trillion over the next century.

The California Water Supply and Demand Model (CWSD) assesses how climate change affects water availability and usage in California, focusing on the energy, urban, and agricultural sectors. The model evaluates scenarios with no adaptation, slow adaptation, and fast adaptation across different climate projections (B1 and A2). Key findings indicate that without adaptation, agricultural water demand will rise due to higher temperatures, particularly in the San Joaquin Valley. While slow adaptation may only marginally reduce use, fast adaptation—driven by higher water prices and technological efficiency—could significantly decrease demand. The report also extends its agricultural analysis to other Western U.S. states, noting a general increase in water demand by 2100.

The document details California's efforts to reduce greenhouse gas emissions to 1990 levels by 2020 under the Global Warming Solutions Act of 2006 (AB32). It outlines a cap-and-trade program scheduled for January 2012, alongside 'early action' measures such as the Low Carbon Fuel Standard and landfill methane capture. The briefing also highlights California's leadership in the Western Climate Initiative and the political support for these measures following the defeat of Proposition 23 in November 2010.

The document analyzes the transition from project-based mechanisms like the Clean Development Mechanism (CDM) to sectoral-scale mechanisms. It evaluates three governance models for a Sectoral Crediting Mechanism (SCM): centralized (UN-led), hybrid (bilateral with UN minimum standards), and decentralized (independent of the UN). The authors argue that while decentralized models offer flexibility, they risk undermining environmental integrity and market credibility. The paper proposes a centralized SCM project cycle that improves upon the CDM by introducing more interactive baseline reviews, professionalizing the regulatory body, and utilizing biennial update reports for better verification.

The document argues that public health professionals have an ethical obligation to communicate the health risks of climate change, as there is a significant disconnect between professional knowledge and public awareness. It recommends framing climate change as a human health problem rather than an environmental one, localizing the issue to make it concrete, and emphasizing 'win-win' health co-benefits of mitigation actions. The guide identifies key target audiences, including journalists, government decision-makers, and vulnerable populations, and suggests specific outreach methods such as using opinion leaders, issuing local scientific reports, and testifying at government hearings.

The document examines the risk of 'double-counting' international greenhouse gas offsets, where both the buyer (developed country) and seller (developing country) count the same emission reduction toward their respective pledges. The authors argue that such accounting could dilute global climate ambition by up to 1.6 billion tons CO2e by 2020, potentially undermining the 2°C warming pathway. The brief analyzes different supply and demand scenarios and proposes policy remedies, such as buyer-only counting, credit-sharing, or the use of an international transaction log to ensure environmental integrity.

The report examines the Swedish hybrid-electric vehicle TIS between 1990 and 2010, finding that while early efforts were driven by urban air quality and concept vehicles, later developments shifted toward fuel efficiency and CO2 reduction. It highlights the role of state-funded R&D programs in maintaining technical knowledge and the significant impact of international dynamics, such as the success of the Toyota Prius and EU emission directives, over national governance in driving commercialization.

The authors developed a framework combining the Water Evaluation And Planning (WEAP) system and the SALMOD population dynamics model with climate data to identify critical temperature and streamflow thresholds for spring-run Chinook salmon in California. This approach aims to evaluate management adaptations to protect salmon, which are vulnerable to rising summer river pool temperatures before autumn spawning.

The report concludes that AB 32 will have a minimal economic impact on the City of Chula Vista and similar California municipalities. Direct energy cost increases are projected to be small, with the 'Conservative case' estimating that the budget could be restored by collecting just $1.97 more per resident annually by 2020. Indirect macroeconomic effects, including changes in employment and output, are estimated to be less than 1%. The authors argue that these impacts are negligible compared to the budget shocks caused by the 2007 economic downturn and the potential long-term costs of climate change inaction.

The study finds that AB 32 is expected to have a minimal economic impact on Chula Vista and similar California cities because energy expenditures constitute a small portion of local budgets. While clean energy policies may slightly increase energy prices, the direct and indirect costs are projected to be very low; for Chula Vista, the budget gap by 2020 could be covered by collecting $1.97 more per resident annually. The analysis notes that these findings are conservative, as they do not account for potential job creation from clean energy or the high costs of climate change adaptation if emissions are not reduced.

The briefing analyzes the shift in U.S. climate policy from a focus on national cap-and-trade legislation toward regulatory agency actions, subnational initiatives, clean-tech funding, and international trade issues. It argues that while a national mandatory system is unlikely in the short term, climate action is diversifying across administrative, local, and trade-related channels.

The Union of Concerned Scientists' 2010 rankings identify Honda as the greenest automaker for model year 2008, followed closely by Toyota and Hyundai. The report highlights a significant performance gap between these leaders and the 'Detroit Three' (Ford, General Motors, and Chrysler), who consistently rank at the bottom due to lower fuel economy and higher emissions. While government standards have improved smog-forming emissions across the industry, global warming emissions remain a key differentiator. The analysis also examines the impact of hybrid and flexible-fuel vehicles, noting that while Toyota's Prius significantly improves its overall score, flexible-fuel vehicles often serve as a loophole for automakers to meet fuel economy requirements without providing real-world environmental benefits.

The report estimates that fine particle pollution from existing U.S. coal plants would cause nearly 13,200 deaths and over 20,000 heart attacks in 2010, with a total monetized health cost exceeding $100 billion per year. While emissions of sulfur dioxide (SO2) and nitrogen oxides (NOx) have declined since 2004 due to the installation of over 130 scrubbers and regulations like the Clean Air Interstate Rule (CAIR), the burden remains high, particularly in the Midwest, South, and Mid-Atlantic regions. The authors argue for a stronger Transport Rule and national emission caps to further reduce these health risks.