What the study found
The study found mixed effects of national carbon taxes in Latin America. Mexico’s carbon tax was linked to statistically significant declines in per capita energy and transport carbon dioxide emissions, while Colombia and Argentina showed no evidence of significant emissions reductions.
Why the authors say this matters
The authors conclude that the findings highlight the importance of policy design, complementary reforms, and institutional context for how effective carbon pricing is. They also say the results help reconcile mixed evidence in the literature and suggest that effective policy requires broader coverage, higher prices, and longer adjustment windows.
What the researchers tested
The researchers evaluated three national carbon tax policies implemented in Mexico (2014), Colombia (2017), and Argentina (2018). They used the Synthetic Control Method, a way of building a data-driven comparison case, with a panel of 30 Latin American countries from 2000 to 2019 to estimate counterfactual per capita carbon dioxide emissions from energy and transport.
What worked and what didn't
In Mexico, the reform was associated with reductions of about 7.9% in per capita energy emissions and 12% in per capita transport emissions after the tax. The authors say these effects likely reflected not only the carbon tax itself, which was modestly priced at up to about USD 3.5 per ton of carbon dioxide, but also the removal of fuel subsidies and other fuel tax changes that raised effective energy prices. In Colombia and Argentina, post-reform energy emissions fell relative to synthetic controls, but these differences did not survive placebo tests, and no significant transport effects were detected.
What to keep in mind
The available summary does not describe limitations beyond the fact that Colombia and Argentina did not show statistically robust effects. The analysis covers three countries in Latin America over 2000 to 2019, so the findings are specific to those cases and policy settings.
Key points
- Mexico’s carbon tax was associated with statistically significant cuts in per capita energy and transport emissions.
- Colombia and Argentina showed no robust evidence of emissions reductions from their carbon taxes.
- The study used Synthetic Control Method with 30 Latin American countries from 2000 to 2019.
- Mexico’s effects likely reflected both the tax and other fuel-price reforms, including subsidy removal.
- The authors say broader coverage, higher prices, and longer adjustment windows may be important for effectiveness.
Disclosure
- Research title:
- Mexico’s carbon tax reduced emissions; Colombia and Argentina did not
- Authors:
- Elias Muzzi, Paula Carvalho Pereda
- Institutions:
- Universidade de São Paulo, Universidade de São Paulo
- Publication date:
- 2026-03-03
- OpenAlex record:
- View
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