A striking growth of CO2 emissions from the global cement industry driven by new facilities in emerging countries

Abstract

Global industrialization and urbanization processes enabled a diverse cement production boom over the past three decades, as cement is the most important building construction material. Consequently, the cement industry is the second-largest industrial CO _2 emitter (∼25% of global industrial CO _2 emissions) globally. In this study, the Global Cement Emission Database, which encompasses anthropogenic CO _2 emissions of individual production units worldwide for 1990–2019, was developed. A recently developed unit-level China Cement Emission Database was then applied to override China’s data and the combination of two databases is used to reveal the unit characteristics of CO _2 emissions and ages for global cement plants, assess large disparities in national and regional CO _2 emissions, growth rates and developmental stages from 1990–2019, and identify key emerging countries of carbon emissions and commitment. This study finds that globally, CO _2 emissions from the cement industry have increased from 0.86 Gt in 1990 to 2.46 Gt in 2019 (increasing by 186%). More importantly, the large CO _2 emissions and the striking growth rates from those emerging countries, including most of the developing countries in the Asia region and the Middle East and Africa region, are clearly identified. For example, the Middle East and Africa, including mostly developing or underdeveloped countries, only represented 0.07 Gt CO _2 in 1990 (8.4% of the total), in contrast to 0.26 Gt (10.4% of the total) CO _2 in 2019, which is a 4.5% average growth rate during 1990–2019. Further, the intensive expansion of large and new facilities since 2005 in Asia and the Middle East and Africa has resulted in heavy commitment (90.1% of global commitment in 2019), and mitigation threats in the future considering their increasing emissions (the national annual growth rate can be up to >80%) and growing infrastructure construction (∼50% of clinker capacity operating ⩽10 years). Our results highlight the cement industry’s development and young infrastructure in emerging economies; thus, future increasing cement demand and corresponding carbon commitment would pose great challenges to future decarbonization and climate change mitigation.

Keywords

• unit-level database
• size- and age-based characteristics
• emerging countries
• striking growth
• carbon commitment