Ethylene is a gas that can be found in nature but it is also a man-made product. It is a colorless, odorless gas, and is often not easily detectable without the aid of instruments. Ethylene can also be produced by plants and plant products such as fruits and vegetables or floral products. In this form it is used as a plant hormone, having an important role in the growth and development of plants. In ancient times it was used as an important anesthetic. The average price of Ethylene is $880-$890 per ton.