Proposing a constitutional amendment prohibiting the imposition of a carbon tax.

HJR 138 proposes amending the Texas Constitution to prohibit the state legislature from imposing taxes based on the carbon content of fuels or emissions of carbon dioxide from goods and services. If approved by voters, it would prevent Texas from enacting any carbon tax policy. The bill failed to pass the Texas Legislature on May 12, 2025, so it did not advance to a voter referendum. This would have directly affected all Texans by blocking a potential state-level carbon tax mechanism.