Cold pizza and climate change: Nearly a billion tons of food went to waste in 2019, according to a UN group, and individual households were responsible for more than half of that. About 17% of the food available to consumers worldwide that year ended up being discarded, while food waste and loss accounted for as much as 10% of global emissions.
If it were a country, that would rank third among the world's sources of greenhouse gases. So eat that leftover slice—you're saving the environment.
