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The report argues that reducing methane (CH4) emissions is critical for slowing global warming in the next two decades, particularly in the Arctic, due to methane's high warming potential and short atmospheric lifespan. It identifies agriculture, waste management, and energy production as the primary anthropogenic sources and evaluates the cost-effectiveness of various mitigation strategies. While sectors like natural gas and coal mining offer high low-cost reduction potentials, the report highlights significant barriers including inadequate regulation, financial risks, and limitations within the Kyoto Protocol's Clean Development Mechanism. To address these, the document proposes the creation of a Global Methane Fund.

The study uses the SIMSDAIRY and LEGGRAZE models to project the impact of climate change on UK dairy systems across four time-slices (baseline, 2020s, 2050s, and 2080s). Findings indicate a general decrease in nitrous oxide (N2O) and overall greenhouse gas (GHG) emissions per litre of milk, but an increase in ammonia (NH3) emissions and nitrate (NO3) concentrations in leachate. While farm profitability and soil quality are projected to improve due to increased land productivity and altered rainfall patterns, the study highlights a trade-off with increased acidifying gases and water pollution.

The document examines the rapid decline of Arctic sea ice and the potential for geoengineering, specifically solar radiation management, as a last-resort insurance policy. It critiques the 'business-as-usual' approach of Arctic nations that prioritize resource extraction over climate mitigation and proposes that the Arctic Council use its scientific legitimacy and inclusive structure to frame the geoengineering debate and conduct necessary research.

The briefing argues that municipal solid waste (MSW) is an underutilized renewable energy resource that can reduce greenhouse gas emissions and landfill reliance. It details five primary conversion technologies—landfill gas capture, combustion, pyrolysis, gasification, and plasma arc gasification—noting that while landfill gas is widely accepted, others face technical or regulatory hurdles. The text highlights that modern waste-to-energy facilities have significantly reduced toxic emissions and can complement recycling by recovering metals. However, it notes that MSW-to-energy receives substantially lower federal subsidies than other energy sources, which hinders commercial expansion.

The report projects that Wisconsin will face significantly hotter summers, increased flooding, and agricultural disruptions if current emissions trends continue. Under a high-emissions scenario, Milwaukee could see more than 55 days per summer over 90°F by the end of the century. The document advocates for a transition to clean energy through renewable electricity standards, energy efficiency, and federal cap-and-trade policies to mitigate these risks.

In 2005, total global anthropogenic greenhouse gas emissions were estimated at 44,153 MtCO2 equivalent, representing a 12.7% increase from 2000. The energy sector, specifically electricity, heat, and transportation, drove much of this growth, with developing countries accounting for the majority of emissions in electricity, heat, and industry. While high global warming potential gases grew by 44% between 2000 and 2005, they remain a small percentage of total emissions. Notably, revised methodologies for calculating land-use change reduced its estimated share of total GHGs from 18.2% to 12.2%, although actual emissions from this sector grew by 4.1% during the period.

The fact sheet describes biomass cofiring—the simultaneous combustion of biomass and a base fuel, typically coal—as a practical bridge to a renewable energy future. It highlights benefits including linear reductions in CO2 and SO2 emissions, lower capital costs for retrofitting existing boilers, and support for sustainable forest management by creating markets for hazardous fuels. However, it identifies barriers such as feedstock preparation costs and ASTM standards that prevent the sale of biomass-contaminated fly ash. The document suggests that replacing 5% of U.S. coal with biomass could reduce total U.S. emissions by 1.5% within 5-10 years.

The document examines the impact of emissions offsets on air quality in California under the Global Warming Solutions Act (AB 32). It highlights a University of California at Berkeley study showing that while in-state offsets produce mixed results—reducing methane but increasing nitrogen oxides (NOx)—out-of-state offsets lead to an increase in nearly every air pollutant, effectively exporting air quality co-benefits away from the state.

The document highlights that atmospheric CO2 retention has increased, sea levels are rising faster than projected, and Arctic sea ice is plummeting more steeply than expected. It warns that the warming effects of CO2 will persist for at least a thousand years even after emissions stop, emphasizing the need for swift reductions in heat-trapping gases.

The clean car standards, initiated by California's AB 1493 and adopted by the California Air Resources Board (CARB), comprise regulations for air quality, global warming, and zero-emission vehicles. These standards aim for a 30% reduction in global warming pollution from new vehicles by 2016 and are more stringent than federal Corporate Average Fuel Economy (CAFE) standards, targeting a fleet average fuel economy equivalent of 39.2 mpg by 2020 compared to the federal 35 mpg. As of January 2009, 13 states and the District of Columbia had adopted these standards, which are projected to reduce cumulative global warming emissions by 451 million metric tons of CO2E by 2020 across those 15 jurisdictions.

The document is an open letter from a coalition of environmental groups urging President Bush and Congress to redirect resources from the Iraq War toward addressing global warming. The authors argue that the U.S., as the world's largest greenhouse gas emitter, must lead a shift toward renewable energy and energy efficiency. They highlight the urgent threats of melting ice sheets in Greenland and methane release from the Siberian tundra, noting that the war in Iraq has already cost at least $400 billion.

The document identifies human activity—specifically the burning of fossil fuels and tropical deforestation—as the primary cause of global warming. It explains that carbon dioxide (CO2) is the most significant driver of climate change due to its high radiative forcing and abundance, outweighing other heat-trapping gases and natural climate drivers like solar intensity. The text clarifies that the ozone hole is not a cause of global warming, though both result from human atmospheric alterations. Observed impacts include a 1°C increase in global average surface temperature since the pre-industrial age, rising sea levels, and ecological shifts such as thawing permafrost and altered species ranges.

Hydroelectric power is a major source of emissions-free electricity that utilizes the hydrologic cycle to generate power via turbines. While it offers a flexible, renewable alternative to fossil fuels, it can cause significant ecological damage, such as blocking fish migration and emitting methane from reservoirs. The document details various turbine types, the role of pumped storage, and the potential for low-impact certification and new development in the U.S. and developing nations.

The document outlines the potential for California farmers to benefit from the Global Warming Solutions Act (AB 32) through financial incentives, the sale of emissions offsets, and the production of bioenergy. It details specific strategies for reducing carbon dioxide, methane, and nitrous oxide, while noting that the California Air Resources Board (CARB) is tasked with developing the regulatory framework to meet 2020 emissions targets.

The document examines the prevalence of gas pipeline refurbishment projects in Russia's Joint Implementation (JI) portfolio, which account for 53% of submitted projects. It analyzes the technical process of reducing methane leaks, the complex institutional structure of Russian gas distribution involving Gazprom and regional companies, and the debate over whether these projects are 'additional' or would have occurred due to economic incentives. The authors argue that while the projects are technically viable and potentially profitable, institutional barriers and a lack of historical leakage data complicate the verification of emission reductions.

The study uses the Triple Bottom Line (BL3) software tool to analyze the environmental pressures of the Transport Equipment, Motor Vehicle, Hotels and Catering, Food and Drink, and Business Services sectors in South West England. It finds that for all five sectors, the largest source of CO2 emissions is associated with direct on-site operations. The Food and Drink sector has the highest overall emissions, while the Motor Vehicle sector is the most efficient per £ spent compared to UK averages. The report highlights that efficiency gains in industrial sectors could be outweighed by increased final demand for resources driven by regional growth and infrastructure projects.

The document serves as the first module of a foundation course on air quality management in Asia. It examines the primary drivers of urban air pollution, including fuel combustion from stationary sources and the significant impact of road traffic, particularly motorcycles and old diesel vehicles. It distinguishes between ambient, indoor, and transboundary air pollution, highlighting the severe health impacts of particulate matter (PM2.5) and the role of greenhouse gases in climate change. The text also assesses the air quality management (AQM) capabilities of 20 Asian cities, categorizing them from 'excellent' to 'limited'.

The document outlines Dr. James E. Hansen's testimony on climate change, highlighting that the United States is the largest source of CO2 emissions and that current 'Business-as-Usual' trends could lead to at least 5°C of warming by 2100. It warns of non-linear ice sheet disintegration in Greenland and West Antarctica, potentially causing sea level rises of 25±10 meters if warming reaches 2-3°C. Hansen argues that abrupt climate changes are practically certain under current emission trends, but an 'Alternative Scenario' could keep warming below 1°C if CO2 emissions are moderately reduced by mid-century and peak by 2100.

Nigeria is identified as the world's largest gas flarer, wasting approximately 2.5 billion cubic feet of associated gas daily, which results in an annual economic loss of US $2.5 billion. The report asserts that flaring has been generally illegal since 1984 under the Associated Gas Reinjection Act, yet continues through a lack of transparency regarding ministerial certificates. Environmental impacts include the emission of roughly 70 million metric tons of CO2 annually and the creation of acid rain that corrodes infrastructure. Health risks for local communities, specifically in Bayelsa State, include increased rates of premature death, child respiratory illnesses, asthma, and cancer due to exposure to particulate matter and benzene. The report criticizes the 'double standards' of the British colonial legacy and the failure of projects like Bonny LNG and the West African Gas Pipeline to prioritize the use of associated gas over non-associated gas.

The report analyzes the economic trade-offs between decentralized and centralized wastewater systems, arguing that while treatment plants exhibit economies of scale, collection networks often exhibit diseconomies of scale. It highlights the financial advantages of modular, 'just-in-time' capacity expansion and the potential for water reuse and nutrient harvesting. The document also details various economic valuation methods for non-market environmental goods and the importance of professional management to ensure system reliability.