Ripening Fruit

Bananas are a major part of diets worldwide, with significant exports. They are transported unripe to prevent damage. Supermarkets use ethane to ripen bananas on demand. An experiment shows ethane's effectiveness in ripening bananas, with ethylene from apples and exhaust fumes also aiding the process. This method ensures bananas are ripe when they reach consumers.

Explain why bananas are shipped while still green.

What are the effects of exhaust fumes on the ripening of bananas?