1) Why are greenhouse gases important? a) They help us breathe b) They inflate the clouds c) They keep the Earth's temperature at the right level 2) Fossil fuels are a) burning fossils b) burning rocks c) coal, oil and gas 3) The Earth is warmed by a) clouds b) the sun rays c) fogs 4) CFCs are dangerous because they a) damage the floor b) damage the ozone layer c) repair the ozone 5) An example of greenhouse gas is a) oxygen b) helium c) carbon dioxide

CLIL4STEAM Global warming

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