Before thinking about efficient ways to reduce our impact on the planet, we need to calculate our carbon footprint. CARBON FOOTPRINT is the sum of all emissions of CO2 (carbon dioxide), which were induced by our daily activities, such as transportation, home energy and appliances, food and personal purchases, in a given time frame. Students will calculate their carbon footprint, using an international, student-oriented footprint calculator that is developed by Stanford University. After collecting, analyzing and evaluating student’s data, a class data file will be send from one school to another. Through this exchange, students will have the opportunity the compare their data and meet other ways of living and thinking across Europe and also realize the globalization of this effect. Issues like greenhouse effect, global warming, climate change and sustainable development will be discussed. Working in groups, students will write a report about effective ways that are relevant with lifestyle decisions to reduce their impact on the planet. They will also observe the relationship between CO2 emissions and GNP and how European crisis affects the environment.