People should go vegetarian for at least two days a week in order to save the planet, according to a new report.
Sir Paul McCartney, Lord Stern and the UN have suggested people may to stop eating meat completely in order to prevent catastrophic climate change.
However, the new report says that if poeple cut meat from their diet for just two days a week - adopting "flexitarianism" - that will be enough to stop global warming.
Meat eating is a problem because cows produce the greenhouse gas methane in large quantities, while it requires a lot more energy and water to produce chickens or other animals rather than vegetables.
The latest research by Friends of the Earth and Compassion in World Farming looked at different diets, farming methods and land use to find out how much carbon dioxide is produced under different models.