Food waste is a bigger cause of climate change than plastics, according to Zero Waste Scotland.
The government-funded body has urged people to cut down the amount of unwanted food they put in the bin.
When food waste ends up in landfill it rots, producing methane gas, one of the most damaging greenhouse gases driving climate change.
Research by Zero Waste Scotland found that 456,000 tonnes of food waste was collected in Scotland in 2016.
About 224,000 tonnes of plastic waste was collected that year.