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*More about Ethylene: Fruits and vegetables give off an odorless, harmless and tasteless gas called ethylene after they’re picked. All fruits and vegetables produce it, but some foods produce it in greater quantities. When ethylene-producing foods are kept in close proximity with ethylene-sensitive foods, especially in a confined space (like a bag or drawer), the gas will speed up the ripening process of the other produce. Use this to your advantage if you want to speed up the ripening process of an unripe fruit, for example, by putting an apple in a bag with an unripe avocado. But if you want your already-ripe foods to last longer, remember to keep them away from ethylene-producing foods, as designated in the chart above.