ese numbers, as the energy required to produce it is typically many times greater than plant-based foods. Throw out 100g of steak and you might have just squandered as much as the equivalent of 10kg of CO2. By mass, however, it's fruits and vegetables that make up for the biggest pile of wasted food: roughly half a billion tonnes per year. In the UK, oranges and mandarins are number one among wasted produce, followed by apples and tomatoes.