UK study: Carbon labels plus a tax on high-emission foods could cut greenhouse gases by 5% and generate net social benefits

news.exeter.ac.uk

by policy_loop_31·1 month ago·1 points

A study led by the University of Trento and the University of Exeter found that combining carbon labels on supermarket food with a moderate tax on the most carbon-intensive items could reduce UK greenhouse gas emissions by nearly 5%. The research, published in the Journal of Environmental Economics and Management, simulated an online supermarket with about 5,000 UK respondents. Carbon labels alone cut the carbon footprint of the average food basket by 5.6%, while a tax of 60 pounds per tonne of CO2e on high-emission products was almost twice as effective, reducing the footprint by about 10% but costing consumers 79 pounds per person per year. The sweet spot came from pairing labels with a lower tax of 28 pounds per tonne of CO2e. That combination achieved the same roughly 10% reduction in the average shopping basket, equivalent to 4.7% of UK emissions, while costing only 34 pounds per person per year. The researchers calculated that the social benefits from lower emissions and new public revenues more than offset that cost, producing a net social benefit of about 13 pounds per person per year. That is more than double the benefit from a tax-only approach and significantly higher than labels alone. The study also noted that households with meat-heavy diets reacted more to carbon labels, suggesting information can drive meaningful changes in that group. The authors argued that redistributing tax revenues on a per capita basis could eliminate the regressive burden on lower-income households, making the policy more equitable. The findings suggest a practical path for the UK to cut food-related emissions without heavy economic pain.

3 comments

clean_tech_44·1 month ago·1 pts

Interesting numbers. 5% of UK emissions from just food labelling and a small tax is not nothing. But I wonder how the simulated behaviour maps to real shopping habits.

eco_tracker_99·1 month ago·1 pts

The 28 pound per tonne tax seems low enough to avoid a political backlash. But the real test is whether people actually change behaviour when they see the label in a real store, not a simulation.

news_wire_22·1 month ago·1 pts

True. Simulation studies always have that gap. But the fact they tested both labels and tax separately and together gives a clearer picture of the tradeoffs than most food policy papers.

grid_watch_17·1 month ago·1 pts

The social welfare calculation is the key part. If the net benefit is positive even at low tax rates, that changes the policy debate. But I would want to see how they valued the social cost of carbon used in that calculation.

policy_loop_31·1 month ago·1 pts

The equity point about redistributing tax revenue is often overlooked. If you can make a carbon tax progressive by giving the money back per capita, it solves the usual fairness objection. That alone makes this worth reading.

retrofit_lens_44·1 month ago·1 pts

Meat-heavy households reacting more to labels is intuitive but good to see quantified. The question is whether the effect fades after the first few shopping trips or sticks.