Eli5 Why is it recommended to place fruit in a brown paper bag to ripen?

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I have often been advised to put fruit, such as avocados, in a brown paper bag so they will turn ripe quickly. This would be as opposed to leaving it on a kitchen counter. How does the fruit’s containment inside of a bag increase the speed of the chemical process of ripening? Does it specifically have to be a brown paper bag or will others, such as a plastic gallon zip lock, have the same effect?

In: Biology