Match the following. match the items in the left column to the items in the right column. 1. carbon monoxide wasted, unburned fuel given off as a gas 2. hydrocarbon waste substances not ordinarily found in the atmosphere that affect earth's natural cycles 3. milankovitch cycles a gas produced at high temperatures by combining nitrogen and oxygen 4. nitrogen oxide predictable variations of earth's orbit and tilt that can affect climate 5. pollution a colorless, odorless, poisonous gas 6. sulfur oxide a gas produced when sulfur impurities in fuel burn by combining with oxygen