Climate disinformation can derail carbon taxes, study finds

A new model from University College Dublin and the ILaVita Foundation shows that climate disinformation can sharply weaken support for carbon taxes, even after ambitious policy starts. The study finds that counter-disinformation efforts can largely restore effective climate policy, while late or persistent misinformation drives worse warming.

Why it matters: - Climate policy depends on public belief as much as economics. - The study suggests carbon taxes can hold up when informed voters are the majority, but that advantage can vanish fast if disinformation shifts opinion. - The findings point to information policy as a practical part of climate action, not just a communications issue.

What happened: - Researchers from University College Dublin and the ILaVita Foundation built a dynamic climate-economy model that includes climate disinformation. - The study appeared in the KeAi journal Risk Sciences. - The model splits the population into two groups: informed agents who understand true climate damages, and misinformed agents who underestimate them. - The share of informed agents changes over time through learning, disinformation shocks, and feedback from visible climate harm. - The team compared two carbon-tax settings: a politically constrained planner and majority voting. - The study found that majority voting can initially produce stronger carbon taxation than a politically constrained planner. - The authors said the median voter backs more ambitious policy as long as informed voters remain the majority.

The details: - In the planner scenario, the policymaker knows the true damages but faces implementation costs when policy goes beyond what public opinion will support. - In the voting scenario, carbon-tax policy changes gradually, reflecting slow real-world tax adjustment. - Once disinformation erodes the informed majority, the study finds a sharp drop in the political target for carbon taxation. - The model shows a cliff-edge dynamic under majority voting, where implemented policy falls rapidly after the informed majority flips. - The planner weakens more smoothly as public support fades. - The study says late or persistent disinformation is especially harmful because it undercuts support after stronger climate policy has already begun. - Under both policy regimes, late or persistent disinformation leads to more severe warming and “hothouse” trajectories. - A sufficiently strong counter-disinformation intervention almost completely offset an early disinformation shock. - With that intervention, outcomes moved close to the no-disinformation benchmark. - The paper’s DOI is 10.1016/j.risk.2026.100063.

Between the lines: - The study challenges the assumption that insulated planners always outperform democratic systems on long-term climate policy. - The model suggests democracy can be an advantage early on, but only if the information environment keeps the informed majority intact. - The cliff-edge result implies climate misinformation can cause sudden policy failure, not just gradual erosion. - The research also implies that reducing disinformation may be cheaper and faster than trying to rebuild support after public trust collapses.

What's next: - Policymakers and climate advocates may use the findings to argue for stronger anti-disinformation measures alongside carbon pricing. - Future climate policy debates will likely put more weight on how public beliefs shape the durability of tax support. - The study suggests that early intervention against disinformation could preserve the political room needed for aggressive mitigation.

The bottom line: - Carbon taxes do not just depend on climate science and economics. - They also depend on whether the public believes the science long enough to keep policy standing.