What the study found
Carbon taxes were linked to lower per capita emissions in Mexico, but not in Argentina or Colombia. The study found no evidence that carbon taxation significantly reduced emissions in Argentina or Colombia, while Mexico showed statistically significant decreases in energy and transport emissions after its reform.
Why the authors say this matters
The authors conclude that their findings show the importance of policy design, complementary reforms, and institutional context for the effectiveness of carbon pricing. They also say the results help reconcile mixed evidence in the literature and suggest that effective policy requires broader coverage and higher prices over longer adjustment windows.
What the researchers tested
The researchers evaluated three national carbon tax policies in Latin America: Mexico in 2014, Colombia in 2017, and Argentina in 2018. They used the Synthetic Control Method, which builds a comparison case from other countries' data, along with a panel of 30 Latin American countries from 2000 to 2019 to estimate counterfactual per capita CO2 emissions from energy and transport.
What worked and what didn't
For Argentina and Colombia, post-reform energy emissions fell relative to their synthetic controls, but these differences did not survive placebo tests, and no significant effects were found for transport emissions. In Mexico, the reform was associated with statistically significant reductions of approximately 7.9% in per capita energy emissions and 12% in per capita transport emissions in the post-tax period.
What to keep in mind
The abstract says Mexico’s tax was set at modest rates, up to about USD 3.5 per ton of CO2, and that its effects likely reflected the tax together with simultaneous removal of fuel subsidies and broader fuel tax adjustments. The summary does not describe other limitations beyond the scope of the comparison across three countries and the reliance on synthetic counterfactuals.
Key points
- Mexico’s carbon tax was associated with significant reductions in per capita energy and transport emissions.
- Argentina and Colombia showed no significant emission-reduction effects from carbon taxation.
- Energy emissions in Argentina and Colombia fell relative to synthetic controls, but the differences did not survive placebo tests.
- The study used the Synthetic Control Method with 30 Latin American countries from 2000 to 2019.
- The authors say policy design, complementary reforms, and institutional context matter for carbon pricing effectiveness.
Disclosure
- Research title:
- Mexico’s carbon tax reduced emissions; Colombia and Argentina showed no clear effect
- Authors:
- Elias Muzzi, Paula Carvalho Pereda
- Institutions:
- Universidade de São Paulo
- Publication date:
- 2026-03-03
- OpenAlex record:
- View
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