For each winner, COTAP will offset 20 tonnes of CO2 on your behalf - a $300 value! To win, you must be among the first 50 Cotappers to refer 5 or more new donors who offset 5+ tonnes ($75) each. New donors/Cotappers are also eligible to win if they refer 5+ new donors who offset 5+ tonnes each. For full program details, and to see who's winning, please see http://cotap.org/10-years/. For questions, please email us at support at cotap dot org.