— Ch. 1 · Fossil Fuel Dominance —
Greenhouse gas emissions.
~5 min read · Ch. 1 of 6
In 2019, coal-fired power stations emitted over 25% of global greenhouse gases. This single source outpaced all other individual emitters combined. Burning oil and natural gas followed closely behind as the next largest contributors to atmospheric warming. The International Energy Agency reported that fossil fuel combustion accounted for 89% of anthropogenic carbon dioxide emissions in that year. A study identified just 5% of the world's power plants as responsible for nearly three-quarters of electricity sector emissions. These facilities span 221 countries yet remain concentrated among a small number of massive generators. Coal remains the dominant driver despite growing adoption of solar and wind technologies. Natural gas plants also contribute significantly to the total output. Drought conditions reduced hydropower generation in 2023, causing an additional rise in emissions from thermal sources. Clean energy technologies have tempered growth but cannot fully offset the scale of existing infrastructure.
Sector Breakdown Analysis
Energy supply sectors generated approximately 34% of global greenhouse gas emissions in 2019. Industry processes contributed another 24%, while agriculture, forestry, and land use made up 22%. Transportation accounted for 15% of the total, and buildings added roughly 6%. Road freight represents more than a quarter of transport-related emissions globally. Maritime shipping contributes between 3.5% and 4% of all greenhouse gases. Aviation operations produced 2.4% of global carbon dioxide emissions in 2018. The building sector alone was responsible for 12 gigatonnes of equivalent emissions that same year. Manufacturing construction materials like steel and cement accounts for 28% of building sector emissions. Over two-thirds of existing buildings will still stand in 2050, requiring retrofitting rather than new construction. Livestock enteric fermentation and manure management drive methane production within the agricultural category. Rice cultivation on flooded fields adds another significant source of atmospheric methane. Human waste decomposition in anaerobic conditions also generates substantial quantities of this potent gas.