Search Climate Insights Directory
193 results
Superbowl XLVIII & Groundhog Day
The briefing compares the climate of East Rutherford, New Jersey, with other NFL cities, noting that while it is a cold-weather venue for Super Bowl XLVIII, it is not the coldest in the league. It highlights historical Super Bowl temperature extremes and records the highest one-day snowfall in NFL cities, specifically noting Foxborough, MA. Additionally, it cites MIT research indicating that temperatures below 50°F negatively impact field goal accuracy more than wind or precipitation.
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Document type: Briefing
Targeting Proposition 39 to Help California’s Schools Save Energy and Money
The document examines how Proposition 39, which provides an estimated $2.75 billion for energy efficiency and clean energy in public buildings, can be targeted to maximize energy savings in California schools. It identifies that while many districts can access low-cost private capital for short-payback projects like lighting, they lack the technical capacity to vet proposals and the funding to pursue deeper, more costly energy-saving measures. The authors recommend using Proposition 39 funds for impartial technical assistance, matching grants for high-impact projects, and targeted support for financially distressed or small districts.
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Document type: Policy brief
GETTING CITIES RIGHT IN CHINA
The document identifies China's urbanization as a critical factor for global climate change, noting that by 2030, China will have approximately 1 billion urban residents. It argues that the current development pattern of 'single use superblocks served by auto-centric transportation' is unsustainable and leads to congestion and pollution. To counter this, the authors propose six 'ingredients for success': permeable urban form (smaller, mixed-use blocks), transit-centered transportation (prioritizing walking, biking, and Bus Rapid Transit), effective and enforced building codes, municipal finance reform to move away from land-leasing incentives, new sustainability performance metrics for mayors, and a strengthened planning process with increased technical capacity.
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Document type: Research paper
Truck Electrification
Medium- and heavy-duty vehicles account for 20 percent of U.S. transportation fuel consumption despite being only 4 percent of vehicles. The document outlines how hybrid-electric, battery electric, and fuel cell technologies, along with external power systems and battery-powered auxiliary units, can reduce fuel costs and oil dependency.
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Document type: Fact sheet
Plug-in Electric Vehicle Deployment
The document details the U.S. effort to reach a goal of one million electric vehicles by 2015 through the development of 'deployment communities' and infrastructure. It describes federal initiatives like the Transportation Electrification Initiative and Clean Cities, regional efforts such as the Northeast Electric Vehicle Network, and commercial fleet adoptions by companies like Frito Lay and General Electric. It also lists specific legislative proposals aimed at increasing consumer tax credits and funding for community deployment and fleet upgrades.
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Document type: Fact sheet
Plug‐in Electric Vehicle Deployment
The document details US efforts to reach a goal of one million electric vehicles by 2015, focusing on federal, state, and local deployment programs, the role of commercial and government fleets, and proposed legislation to incentivize PEV adoption and infrastructure.
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Document type: Fact sheet
Truck Electrification
The report examines the application of hybrid-electric, battery-electric, fuel cell, and plug-in hybrid technologies in the US trucking sector. It highlights specific use cases, such as urban delivery, port drayage, and auxiliary power units, noting that while medium- and heavy-duty trucks make up only 4% of road vehicles, they account for approximately 20% of transportation fuel consumption. The document argues that expanding electrification is a key strategy for doubling truck fuel efficiency and halving projected US oil consumption over 20 years.
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Document type: Report
CLEAN AIR AND SUSTAINABLE CITIES IN CHINA
The briefing addresses the urgency of improving air quality in China following severe pollution events in Beijing. It argues that while fuel quality standards are a necessary first step, long-term success requires avoiding car-reliant urban development. The author advocates for 'transit-oriented development' characterized by walkable, mixed-use neighborhoods and high-quality public transit, specifically Bus Rapid Transit (BRT), to reduce transportation-related emissions. Additionally, the document highlights the role of energy-efficient building standards in reducing power plant pollution and the benefit of compact cities in preserving natural ecosystems.
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Document type: Briefing
What is District Energy?
District energy systems provide centralized heating and cooling to multiple buildings via underground pipes, utilizing sources such as combined heat and power (CHP) plants, waste heat, and renewables. In the United States, over 700 such systems exist, offering benefits like reduced fuel consumption, lower peak electrical demand, and decreased greenhouse gas emissions. While high upfront infrastructure costs can be a barrier, examples from universities and city centers demonstrate significant energy savings and carbon reductions.
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Document type: Fact sheet
Health Impacts of Diesel, Based on Data from the NationalScale Air Toxics Assessment (NATA)
The report uses data from the National-Scale Air Toxics Assessment (NATA) and the Environmental Benefits Mapping and Analysis Program (BenMAP) to quantify the health burden of diesel PM2.5. It finds that offroad diesel sources generally cause more cases of premature mortality and higher economic costs than onroad sources. The analysis employs a variety of epidemiological studies to estimate endpoints ranging from adult mortality to childhood asthma exacerbations, applying EPA-standard unit values and income adjustments to determine the economic impact.
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Document type: Report
California Diesel Truck Rules
The document details two 2008 CARB regulations: a Global Warming Rule targeting heavy-duty truck fuel efficiency through aerodynamic features and tires, and a Smog and Particulate Rule requiring diesel particulate filters for trucks over 14,000 pounds. It highlights projected benefits, including the prevention of 9,400 premature deaths and billions in health cost savings, while suggesting further improvements to the global warming rule to cover more vehicle types.
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Document type: Fact sheet
Delivering the Green
The Union of Concerned Scientists analysis indicates that retrofitting new and existing heavy-duty trucks with aerodynamic technologies and fuel-efficient tires could reduce national global warming pollution by 17 million metric tons of CO2eq by 2020. Such improvements could save over 1.4 billion gallons of diesel fuel nationally and 200 million gallons annually in California by 2020, while providing net savings of over $30,000 over the life of a typical new long-range truck.
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Document type: Fact sheet
Comparison of Life-Cycle Analyses of Compact Fluorescent and Incandescent Lamps Based on Rated Life of Compact Fluorescent Lamp
The study finds that CFLs provide significant environmental benefits over incandescents, primarily through reduced greenhouse-gas emissions during the operation phase. Despite concerns over their complex manufacturing and mercury content, the analysis shows that the energy efficiency of CFLs outweighs these factors. Even under short operating cycles that reduce lamp life, CFLs remain a net environmental win, though their economic payback period increases. The report also notes that while CFLs release more lead and arsenic than incandescents, they result in lower overall mercury emissions when accounting for the mercury released by coal-fired power plants required to power incandescent bulbs.
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Document type: Research paper
Our Changing Climate
The report warns that California faces significant risks from global warming, with projected temperature increases between 3°F and 10.5°F by the end of the century. These changes threaten to severely reduce Sierra Nevada snowpack, increase the frequency of large wildfires, degrade air quality, and disrupt the state's $30 billion agriculture industry. The document emphasizes that while some changes are unavoidable, the most severe consequences can be avoided by reducing heat-trapping emissions to levels that keep warming within the lower range of 3 to 5.5°F.
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Document type: Report
Nuestro Clima Cambiante
The report analyzes how varying levels of greenhouse gas emissions will lead to temperature increases in California, ranging from 3 to 10.5 °F by the end of the century. It details severe risks including a 70-90% reduction in Sierra Nevada snowpack, increased frequency of extreme heat and wildfires, and rising sea levels that threaten coastal infrastructure. The document emphasizes that while some changes are inevitable, the most severe outcomes can be avoided through aggressive emission reductions, aligned with California's executive goals to return to 1990 emission levels by 2020.
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Document type: Executive summary
Clean Air Task Force Investigations of School Bus Engine Crankcase Emissions and Controls
The document reports that engine crankcase emissions are the primary source of PM2.5 mass in conventional school bus cabins, while the tailpipe is the main source of ultrafine particles, black carbon, and particulate polycyclic aromatic hydrocarbons. Research across four US cities indicates that while diesel particulate filters (DPFs) and ultra-low sulfur diesel (ULSD) reduce ultrafines and black carbon to ambient levels, they do not significantly reduce PM2.5. The installation of a closed-crankcase filtration device, specifically the Donaldson Spiracle™, was found to be critical and necessary to reduce cabin PM2.5 levels to near ambient levels across all tested bus and fuel combinations.
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Document type: Fact sheet
REVIEW OF MARPOL ANNEX VI AND THE NOx TECHNICAL CODE
The document advocates for the International Maritime Organization (IMO) to strengthen MARPOL Annex VI by introducing rigorous limits on nitrogen oxides (NOx), sulphur oxides (SOx), and particulate matter (PM) for all ships. It provides evidence that current shipping emissions are under-regulated and cause significant public health and environmental damage, while asserting that advanced control technologies—such as selective catalytic reduction (SCR) and humid air motors (HAM)—make substantial reductions feasible and cost-effective. The submission highlights regional regulatory trends in the European Union and California as precursors to the need for a consistent global standard and urges the adoption of shore-side power standardization.
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Document type: Statement
Clearing theAir in the San Joaquin Valley
The San Joaquin Valley shares the distinction of having the worst air quality in the United States, driven by a combination of geographic trapping, rapid population growth, and a history of regulatory neglect. The region struggles with chronic ozone and particulate matter (PM) pollution, which disproportionately affects vulnerable populations and damages the agricultural economy. While recent legislation has begun to regulate previously exempt agricultural sources and diesel emissions, the report argues that coordinated action across jurisdictional levels is required to address emissions from sources outside local control, such as heavy-duty trucks and locomotives.
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Document type: Report
Rolling Smokestacks
The report argues that while diesel trucks and buses are essential for commerce, they are disproportionate sources of smog, soot, and greenhouse gases. It evaluates a transition from conventional diesel to a 'green truck path' involving advanced exhaust controls, natural gas, hybrids, and fuel cells. The authors model a 2030 scenario where aggressive policies could reduce pollutant emissions by over 90% and global warming pollutants by 26%, while maintaining current oil consumption levels despite doubling truck travel.
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Document type: Report
Health Effects from Ozone in the Eastern United States
The report analyzes the health impacts of ground-level ozone in the Eastern United States, specifically the OTAG region, using 1997 monitoring data and epidemiological concentration-response functions. It estimates that ozone exposure led to 53,000 respiratory hospital admissions, 16,000 cardiovascular hospital admissions, and 159,000 total respiratory emergency room visits during the April-October 1997 season. The analysis highlights significant uncertainty regarding mortality and chronic illness, which were excluded from the quantitative estimates. The findings are compared with a study by the American Lung Association, showing reasonably close results for respiratory admissions.
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Document type: Report