Join the Dalhousie Office of Sustainability for a month long challenge designed to teach you how to take action and incorporate sustainability into your life while you win prizes! November 0 All Day Sustainability Calendar Challenge Join the Dalhousie Office of Sustainability for a month long challenge designed to teach you how to take action and incorporate sustainability into your life while you win prizes! November 0 All Day Sustainability Calendar Challenge Join the Dalhousie Office of Sustainability for a month long challenge designed to teach you how to take action and incorporate sustainability into your life while you win prizes!