It’s the reduction in emissions that most counts towards accumulating points.
Additional points can be earned through success with periodic “challenge” opportunities. Both of these methods are used to determine each player’s points score with the team’s score being the average of all members’ individual scores. Emissions-based points are derived from players’ real carbon footprint numbers. (The Sustainable Lifestyles Game utilizes the CoolClimate Calculator from the UC Berkeley Renewable and Appropriate Energy Laboratory.)