Ethylene, also called alkenes, is a flammable gas with taste, odor, but no smell. Ethylene is found in natural gases, petroleum, and most relevant for plant hormones. Ethylene stops plant growth and as a result, ripens the fruits. At the same time, ethylene helps our environment because if there was ever a run on fruits and vegetables, farmers could speed up the process of ripping the fruits and vegetables with ethylene and distribute them to others. There are problems with ethylene too. These include, fading of color in the plants, exposure to humans which raises the chance of cancer, and because ethylene is an inflammable gas, it can cause fires. The fading of the color in plants will kill the plants. Since ethylene is flammable, it can cause fires and harm many plants and animals.