1) What gases are carbon dioxide and methane also known as? a) Emissions b) Greenhouse gases c) Fragrant gases d) Poison gases 2) What percentage of global temperature increase is carbon dioxide responsible for? a) 80% b) 65% c) 90% d) 78% 3) How many degrees Celsius has air temperature increased since the industrial revolution? a) 2 b) 3 c) 5 d) 1 4) In the past, how long did it take for the Earth to warm up 5 degrees Celsius? a) 4000 years b) 5000 years c) 3500 years d) 6000 years 5) What is the layer of gas that surrounds the Earth called? a) Oxygen b) Nitrogen c) Atmosphere d) Nothing

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