greenhouse gas
nounUK /ˈɡriːnhaʊs ɡæs/
US /ˈɡriːnhaʊs ɡæs/
A greenhouse gas is a gas in the air that traps heat and keeps the Earth warm.
Carbon dioxide is a greenhouse gas that comes from burning fuel.
OTHER MEANINGS
2. A gas that absorbs infrared radiation and contributes to the greenhouse effect.
Scientists measure greenhouse gas levels to track climate trends.
3. Any of several gases, such as carbon dioxide or methane, released by human activities that warm the planet.
Cars and factories release greenhouse gases into the air.
4. A gas whose buildup in the atmosphere can lead to rising global temperatures.
Reducing greenhouse gas emissions is a key goal of many countries.