"The default switches had a greater effect than the carbon labels," says Seger. "We speculated in the paper that the default switches [led to] more changes between categories (from red to yellow or green), while the information labels may have [resulted in] more changes within categories." For example, people would stick to the red-labelled dishes, but opt for a 1.8 kg CO2e dish instead of a 2.4 kg CO2e one, he explains.

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