“Those who still claim that global warming is not caused by the greenhouse effect through human activities are a bit like people still believing that the earth is flat”. GERHARD BERZ, scientist

The Earth’s climate is changing on both global and regional scales… and most of the warming observed over the last 50 years is attributable to human activities. Do you know, for example, that human activities have been increasing the atmospheric concentrations of greenhouse gases and aerosols since the pre-industrial era? Do you know which is the most important man-made greenhouse gas? What’s the link between global warming and the ozone layer's depletion? How can your consumption habits contribute to global warming reduction/increase?

• YXC has prepared a multiple-choice quiz to challenge your knowledge on climate change phenomena: do you know what the most common greenhouse gas emitted by human activity is? And how much the carbon dioxide concentration in the atmosphere has changed over the last 100 years? What should we do to reduce global warming? Need help to find out the right answers? Use the links below to get more info before playing, or - if you prefer - go straight to Global warming? No, thanks! and test your knowledge on such a complex issue. Good luck! (A)

• The mission of the US Environmental Protection Agency (EPA) is to protect human health and the environment. Its database represents one of the accredited environmental information sources in the world. Go to the Kids Site and check out Global Warming Games [epa.gov/globalwarming/kids/games/index.html]: quizzes, word searches, crossword puzzles and more. Designed for the youngest, but useful for everybody looking for basic information while having fun. (B)



• Let your virtual guide - a funny moustached frog - driving you across the EcoKids’ climate change eco-quizzes page [www.ecokidsonline.com/pub/eco_info/topics/climate/quiz/index.cfm]. Here you’ll find four colourful multiple-choice tests to explore causes and effects of global warming, its consequences on the weather and the wildlife… EcoKids' website is part of Earth Day Canada's environmental education program designed to empower Canadian (and worldwide) youth with environmental knowledge and hands-on activities. Information is presented in fun, exciting ways that increase awareness and encourage active community involvement. (B)



• Discover the difference between climate and weather and take the temperature of our planet with the Hot or not trivia challenge [ www.fortwhyte.org/fwEnviro_Ed_climate.html]: the game is hosted in the website of the Fort Whyte Centre, one of Canada's premier privately operated, non-profit, outdoor education and recreation facilities. (B)

• YXC has prepared for you What’s that hole? - a multiple choice quiz on ozone layer depletion. In which part of the atmosphere is the ozone layer located? Where was the ozone ‘hole’ discovered? Which kinds of emissions are responsible for the greatest share of ozone depletion? Answer the questions and… act as a consequence when making your purchasing choices! (A)