a gas without colour or smell, produced when you breathe out or when substancescontainingcarbon are burnt. The fact that the earth is gettinghotter because of carbon dioxide in the atmosphere is calledthe greenhouse effect. 二氧化碳
chlorofluorocarbon: a gas used in fridges and in some aerosolcontainers. CFCs are not often used any more because they damage the ozone layer of the Earth's atmosphere. 含氯氟烃(用于冰箱及喷雾器中)
a gas that stops heat from escaping from the atmosphere and causes the greenhouse effect. Carbon dioxide is a greenhouse gas. 温室气体(造成大气层热量不能散发的气体,如二氧化碳)
the effect of too much artificial light at night, which prevents people from seeing the night sky properly and may affect the natural rhythms of living things