World economies' progress in decoupling from CO₂ emissions

Area of Science:

• Environmental Science
• Economics
• Climate Change Studies

Background:

• The Environmental Kuznets Curve (EKC) hypothesis suggests environmental degradation initially rises with economic growth but falls at higher income levels.
• Traditional econometric methods for analyzing the EKC hypothesis may have limitations.
• Understanding the dynamic relationship between economic growth and carbon dioxide (CO2) emissions is crucial for climate policy.

Purpose of the Study:

• To investigate the relationship between economic growth and CO2 emissions using an alternative methodology.
• To assess the extent of decoupling between GDP per capita and CO2 emissions per capita across countries and over time.
• To evaluate progress towards the Paris Agreement's goal of limiting global temperature rise.

Main Methods:

• A novel segmented-sample regression approach was employed.
• The analysis covered 164 countries, representing 98.34% of the global population.
• Data spanned various periods from 1822 to 2018.

Main Results:

• The association between GDP per capita and CO2 emissions per capita is weakening but remains positive globally.
• Only 49 out of 164 countries have successfully decoupled CO2 emissions from economic growth.
• A majority of countries in Africa, the Americas, and Asia have not decoupled, while most in Europe and Oceania have.

Conclusions:

• Global decoupling of CO2 emissions from economic growth is not being achieved.
• Current trends indicate a divergence from, rather than an approach to, the Paris Agreement's 1.5°C target.
• There is an urgent need for effective climate policies to address the persistent link between economic growth and emissions.