Food waste is one of the biggest issues that contribute to our impact on the planet. There is so much energy, water, labor, transportation, and packaging that goes into producing and delivering food. When it is wasted, we also waste all that energy. If you can waste less food, then you will use fewer resources and have less impact on the planet.
Try to buy only the food you need that will not spoil before you can eat it. Make the effort to eat all the food you make before it spoils. Save your leftovers from restaurants or when cooking from home.