This might help,the presence of hydrochloric acid creates an acidic environment within the stomach that is needed to convert pepsinogen to pepsin. Mucus that is produced by the epithelial cells of the stomach help protect the lining of the stomach from the corrosive hydrochloric acid and pepsin.
These greenhouse gases are trapping the heat inside the atmosphere. When more of these gases are released, it contributes to global warming and the melting of many polar areas that could potentially cause a natural disaster in the future.