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The Intergovernmental Panel on Climate Change has released its final installment of the Sixth Assessment Report, Working Group III’s report on the global assessment of climate change mitigation progress and pledges “Climate Change 2022: Mitigation of Climate Change” (the Report). It also released an accompanying Summary for Policymakers and Technical Summary. The Report considers and documents the scientific, technological, environmental, economic, and social aspects of mitigation of climate change and notes the growing role of non-state and sub-national actors including cities, businesses, Indigenous Peoples, citizens, transnational initiatives, and public-private entities in addressing the impacts and causes of climate change. The Report has been highly anticipated and is the first mitigation report that the IPCC has published since 2014. It provides an unprecedented level of scientific analysis on the options to mitigate climate change, including a significant focus on carbon dioxide removals and the costs of emissions reductions. This bulletin briefly highlights key findings of the Report. Recent developments and current trends. The Report notes that: Total greenhouse (GHG) emissions continued to rise during the period 2010–2019, largely attributed to urban areas, and that the average annual GHG emissions during 2010–2019 were higher than in any previous decade. Reduced emissions from industrial processes and fossil fuels have been more than offset by increased emissions from rising global activity levels in industry, energy supply, transport, agriculture, and buildings. Global GHG emissions in 2030 associated with the implementation of nationally determined contributions (NDCs) announced prior to COP26 make it likely that warming will exceed 1.5°C during this century. Policy, cost, deployment of low-emission technologies and finance. The Report notes that: The cost of low-emission technologies such as photovoltaics, onshore and offshore wind, concentrating solar power, and batteries for passenger electric vehicles (EVs) has continued to decrease since 2010, as demonstrated by an over…

The Intergovernmental Panel on Climate Change (IPCC) yesterday released the IPCC Working Group 1 report, “Climate Change 2021: The Physical Science Basis” (the Report), part of the Sixth Assessment Report, providing an updated assessment of the physical understanding of the current state of the climate system and climate change. The Report predicts that global temperatures are likely to continue to increase beyond the 1.5-2°C target of the Paris Agreement without widespread and steep global reductions in greenhouse gas (GHG) emissions. This bulletin summarizes the Report’s key findings. The current state of the climate. The Report reiterates that the warming of the atmosphere, oceans, and land are human-caused, with rapid changes being observed in the atmosphere, ocean, cryosphere, and biosphere. In addition, the Report confirms that anthropogenic climate change is globally affecting weather and climate extremes, with increased heatwaves, heavy precipitation, droughts, and tropical cyclones more readily attributed to human influence. Possible climate futures. According to the Report, under all emissions scenarios, global surface temperatures will continue to increase until mid-century, with temperatures predicted to exceed 1.5-2°C this century without deep reductions of GHGs. As the climate warms, changes in climate systems will become larger, increasing the frequency and intensity of hot extremes, marine heatwaves, heavy precipitation, droughts, intensity of tropical cyclones, and reductions in Arctic sea ice, snow cover, and permafrost. The Report indicates that changes in the ocean, ice sheets, and global sea levels, resulting from past and future GHG emissions, will likely be irreversible for hundreds of years. Climate information for risk assessment and regional adaptation. The Report indicates that all regions are expected to increasingly experience concurrent and multiple changes in climatic impact-drivers amplified at 2°C compared to 1.5°C, with greater increases at even higher global temperatures. The Report also indicates that even “low-likelihood” outcomes such as…