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Unhealthy foods have a very high carbon footprint. Therefore, taxing them can help reduce carbon emissions, which can be great for the environment.
An unhealthy food tax can encourage manufacturers to shun junk food in favour of healthy food products.
Many countries in the world have versions of unhealthy food taxes.
Check this out: Colombia has introduced a junk food tax that will reach 20% in 2025.
https://www.theguardian.com/global-development/2023/nov/10/colombia-junk-food-tax-improve-health-acc
Taxing unhealthy foods can be an effective strategy for tackling obesity, especially among kids.