Global greenhouse gas emissions by sector
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Global Greenhouse Gas Emissions by Sector
Energy Sector: Dominant Source of Emissions
The energy sector remains the largest contributor to global greenhouse gas (GHG) emissions, primarily due to fossil fuel combustion for electricity and heat generation. This sector alone accounted for a significant portion of the 58 GtCO2eq of global GHG emissions in 2018 . Despite some progress in decarbonizing energy systems in regions like Europe and North America through fuel switching and increased use of renewables, fossil-based energy systems continue to expand in rapidly industrializing regions . Countries that have managed to reduce their emissions have primarily achieved this through changes in their energy sectors .
Industrial Sector: A Major Contributor
The industrial sector is responsible for approximately 30% of global GHG emissions . Key drivers of emissions in this sector include the production of materials such as steel and cement, which are energy-intensive processes. In Canada, for example, the industrial sector's emissions increased by almost 32% between 1990 and 2017, driven largely by activity levels and economic output . Globally, the demand for materials continues to drive emissions growth, particularly in regions like Eastern Asia .
Transport Sector: Emissions on the Rise
Transport is the second-largest source of emissions in many countries, with emissions either stable or increasing . The sector's emissions are driven by the growing demand for travel and freight transport, particularly in rapidly developing regions. Despite some advancements in fuel efficiency and the adoption of electric vehicles, the overall impact on emissions has been limited .
Buildings Sector: Growing Energy Demand
The buildings sector contributes significantly to GHG emissions through the consumption of energy for heating, cooling, and lighting. The demand for floor area and energy services in buildings has driven emissions growth, especially in urbanizing regions of Asia . Efforts to improve energy efficiency in buildings have been made, but the overall impact on reducing emissions has been modest.
Agriculture, Forestry, and Other Land Use (AFOLU): Significant but Overlooked
The AFOLU sector is responsible for a substantial share of global GHG emissions, estimated to be up to 30% . Emissions in this sector are driven by activities such as deforestation, livestock production, and soil management. Recent increases in AFOLU emissions have been observed in regions like Latin America and Africa, primarily due to the expansion of agriculture into carbon-dense tropical forests . Despite its significant contribution, the AFOLU sector often receives less attention compared to energy and industrial sectors.
Conclusion
Global GHG emissions are driven by multiple sectors, with the energy sector being the largest contributor. While some regions have made progress in reducing emissions through changes in energy systems, overall global emissions continue to rise. The industrial, transport, buildings, and AFOLU sectors also contribute significantly to emissions, each with its own set of challenges and drivers. Addressing emissions across all these sectors is crucial for meeting global climate targets.
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