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+# Mandatory Features
+The user must be able to indicate he or she has acted contributingly towards her score. These actions include and are limited to:
+* Eating a vegetarian meal
+* Buying local produce
+* Using the bike instead of the car
+* Using public transport instead of the car
+* Lowering the temperature of your home
+* Installing solar panels
+
+The score should be expressed in the amount of CO2 you save, and should be shared/compared with your friends. The user should also receive badges or achievements etc. for achieving certain scores. Bonus features are do add additional points to the grade.