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The report presents a taxonomy of future global scenarios divided into three classes: Conventional Worlds, Barbarization, and Great Transitions. It argues that while current trends in population growth, economic expansion, and technological change drive the system, human agency and policy choices can steer the world away from collapse and toward a sustainable paradigm. The authors contrast 'business-as-usual' trajectories with visionary transitions that prioritize equity and ecological health over material growth.

The report presents four narrative scenarios for the future of U.S. municipal water systems in 2010, structured around two critical uncertainties: the extent of the federal government's regulatory and managerial role and the availability and cost of capital. The scenarios—'Mandate', 'Approaching Apocalypse', 'Seeking Camelot', and 'Off to Market'—explore how different combinations of these drivers, alongside factors like public health concerns, technological advances, and demographic shifts, could shape water infrastructure, quality, and management. The document emphasizes that these are not predictions but tools to help water managers and policymakers identify risks and develop robust strategies.

The report analyzes China's energy system, which was heavily coal-dependent in 1990, and projects environmental loadings up to 2020. It compares a Business-As-Usual (BAU) scenario with two enhanced environmental scenarios, demonstrating that while BAU leads to significant increases in SO2 and CO2 emissions, targeted policy interventions in energy mix, efficiency, and clean coal technology can mitigate these impacts. The study recommends shifting toward hydropower, nuclear power, and natural gas, alongside the implementation of pollution levies and integrated planning to achieve sustainable development.

The report analyzes the energy-intensive nature of the Texas transportation system, which is heavily dependent on petroleum. Using the LEAP/EDB model, it compares a Reference Scenario (status quo) against four alternatives: Rollback, Moderate, Aggressive, and Visionary. The findings indicate that while the Reference Scenario projects a 44.2% increase in energy use by 2020, the Visionary Scenario could reduce energy consumption to levels below 1994 totals. The study emphasizes that aggressive pricing and technological shifts are necessary to achieve significant energy savings and air quality improvements.

The report analyzes four energy scenarios for the US up to 2030: a Reference case, a Market case, an Environmental case, and a Climate Stabilization case. It finds that shifting toward efficiency and renewables can lead to net economic savings of up to $2.3 trillion and dramatic reductions in CO2 emissions. The authors propose a comprehensive policy framework based on harnessing market forces, establishing efficiency standards, and increasing R&D investment to move the US away from its current reliance on polluting fossil fuels.

The briefing assesses the viability of nuclear power as a solution to global warming, concluding that it is an ineffective strategy compared to energy efficiency. Analysis shows that even under highly optimistic assumptions—such as reduced construction times and costs—massive nuclear investment cannot prevent CO2 growth in high or medium energy demand scenarios. In the United States, the author asserts that investment in electrical efficiency displaces nearly seven times more carbon per dollar than investment in nuclear power. The document emphasizes that the primary driver of future emissions is the level of energy demand, and that efficiency improvements in the commercial, industrial, and transportation sectors offer vast, low-cost opportunities to reduce carbon output.

The report argues that Poland must adopt a technology-inclusive strategy to decarbonise its power system, as relying on a narrow set of technologies increases costs and infrastructure requirements. Modelling indicates that while wind and solar are cornerstones, 'clean firm power' from nuclear and gas with carbon capture and storage (CCS) is essential for reliability. The study warns that excluding nuclear or CCS could triple necessary transmission infrastructure and increase system costs. To meet 2050 targets, Poland needs to accelerate onshore wind deployment to a peak of 7 GW/year and establish a nuclear fleet exceeding 8 GW.

The document asserts that Germany cannot reach its 2045 climate neutrality goals without carbon management technologies. It estimates that 3-17 million tonnes of CO2 from unavoidable industrial emissions must be captured annually by 2045, alongside 17-47 million tonnes of negative emissions. To enable this, the author calls for a political roadmap, legal framework, and infrastructure development starting in the current decade.

The study evaluates four primary technology pathways for Germany's power sector decarbonisation by 2050: 'All Tech.' (inclusive of nuclear and CCS), 'No CCS', 'No Nucl.', and 'No Nucl. No CCS'. The 'All Tech.' scenario is identified as the most competitive, offering the lowest total system costs and electricity prices. The 'No Nucl. No CCS' scenario, which most closely represents current German policy, results in the highest costs, highest electricity price volatility, and greatest reliance on transmission and hydrogen infrastructure. The analysis emphasizes that nuclear power and Carbon Capture and Storage (CCS) significantly enhance economic competitiveness and system resilience. It also explores the role of long-duration energy storage (LDES), finding that 24-hour systems can facilitate solar expansion and reduce reliance on costly hydrogen-fuelled power plants.

The report assesses California's path to a net-zero carbon economy by 2045, specifically examining the necessity of 'clean firm power'—zero-carbon electricity that is available on demand regardless of weather. Using three different optimization models (RESOLVE, urbs, and GenX), the authors find that relying solely on wind, solar, and batteries would require nearly 500 GW of capacity and increase wholesale electricity rates by approximately 65%. In contrast, integrating 25-40 GW of clean firm power—such as nuclear, geothermal, or gas with carbon capture and storage (CCS)—can maintain costs similar to today's levels (around 9 cents/kWh) while significantly reducing the land and transmission infrastructure needed. The report concludes that a diverse portfolio of clean firm resources is the most cost-effective way to ensure grid reliability during extended periods of low renewable output, known as 'dunkelflaute'.

This document is an excerpt from the Eskom Air Quality Strategy (Unique Identifier: 32-1143, Revision 1), detailing the risks, financial requirements, and technical challenges associated with meeting Minimum Emission Standards (MES) for its power stations. It outlines the potential legal and operational consequences of non-compliance, provides a scenario analysis for implementation, and lists the specific retrofits and resource increases required for full compliance by April 1, 2020.

The report highlights that the agricultural sector is the largest source of methane emissions in the EU, accounting for 53% of total anthropogenic methane emissions in 2019. It argues that current EU policies lack the ambition and urgency needed to meet the Global Methane Pledge's 30% reduction target by 2030. A study by CE Delft indicates that while a 'business-as-usual' scenario would only yield a 13.4% reduction, the EU could potentially reduce emissions by 49% to 68% if all available mitigation measures are adopted, including a widespread shift toward healthier diets with lower meat and dairy consumption. The report emphasizes that dietary changes alone could reduce total EU methane emissions by 15% to 19%. It recommends that the EU establish science-based methane reduction targets for the agricultural sector, promote plant-based diets through the Sustainable Food Systems Framework Law, and impose binding methane reporting and reduction targets on companies operating within the EU.

The report finds that climate change acts as a significant drag on Canada's economy, reducing GDP growth, causing job losses, and increasing fiscal pressure on governments. It highlights a 'broken window fallacy' where spending on repairs masks deeper losses in household income and productive investment. The analysis indicates that Northern Canada and Alberta are particularly vulnerable, and that a combination of proactive adaptation and low global emissions could reduce total real GDP losses by 75%.

The report quantifies the economic burden of climate change on Canada, predicting significant GDP losses, job reductions, and decreased household income by the end of the century. It highlights a 'broken window fallacy' where spending on repairs masks the opportunity cost of lost productive investment. The analysis finds that the North and Alberta are most vulnerable, and that combining proactive adaptation with global emission reductions could eliminate 75% of real GDP losses, with adaptation investments yielding a return of $13 to $15 for every dollar spent.

The document outlines three distinct net-zero energy system pathways for Canada: a fossil fuel system reliant on negative emissions, a biofuel-dominant system, and an electrification and hydrogen-based system. It identifies internal factors within Canada's control, such as domestic policy and infrastructure, and external factors like global market trends and technological innovation that will influence the evolution of these systems. Each pathway is analyzed through its specific upsides, downsides, and implementation barriers, ranging from the risk of delaying structural economic change in fossil fuel systems to the massive land-use footprints required for biofuels and electrification.

The document evaluates three potential energy systems for Canada's transition to carbon neutrality: one based on fossil fuels with negative emissions, one based on second-generation biofuels, and one based on electrification and hydrogen. It identifies that while Canada possesses assets like land and infrastructure, the choice of system depends on factors such as technological viability, social justice, and international market trends.

The study evaluates three energy scenarios (A, B, and C) to determine the fuel mixes required to limit atmospheric CO2 concentrations. Scenario A assumes unlimited CO2 increase, while Scenario B limits the increase to 75% and Scenario C limits it to 440 ppm. The analysis highlights that achieving these limits would require a massive shift toward non-fossil fuels, such as nuclear, solar, and biomass, as coal and shale oil are identified as high-emission sources. The document warns that CO2 concentrations reaching 500 ppm would likely cause undesirable climatic changes, whereas 440 ppm is considered a relatively safe level.

The report warns that under a 3°C warming scenario, approximately 800 million people (10% of the global population) would live on land below the projected high-tide line. It highlights that Asia is the most exposed region, with China, India, Vietnam, and Indonesia facing significant risks. The document argues that adhering to the Paris Agreement's 1.5°C target could reduce this exposure by approximately half, potentially saving many coastal megacities from abandonment or the need for unprecedented flood defenses.

The research paper evaluates nine climate policy scenarios to determine the most effective way to address carbon leakage in the EU ETS. Using the CASE II model, it compares full auctioning against various border adjustment (BA) and output-based allocation (OB) strategies. The findings suggest that while full auctioning leads to a leakage ratio of 10%, border adjustments are the most efficient at reducing this ratio, often resulting in negative leakage (spillovers) where emissions in the rest of the world actually decrease. Output-based allocations also reduce leakage but are less efficient than border adjustments and can lead to higher carbon prices.

The report argues that the EU's energy security, particularly regarding natural gas, cannot be solved by a 'magic bullet' but requires a combined approach of supply-side and demand-side measures. While LNG and internal market infrastructure reduce vulnerability to supply disruptions, demand-side actions like energy efficiency and renewables are essential to reduce the overall cost of imports and long-term dependency. The analysis highlights that Central and Eastern European Member States remain particularly vulnerable to Russian supply cuts, but that decarbonization goals in the power sector do not necessarily conflict with gas security due to the sector's fuel-switching capabilities. The report concludes that the EU should set ambitious, quantifiable energy efficiency and renewable targets to reinforce its strategic resilience.