The World Circular Economy Forum 2021 (WCEF2021) will be hosted online by the Government of Canada and SITRA from September 13 to 15, 2021. Building on previous forums, WCEF2021 will focus on the system-level changes, or “game changers” needed to accelerate the transition to a circular economy. Seizing the circular opportunity requires transformational change and collective efforts by businesses, policymakers, civil society and others. Hosted in North America for the first time, WCEF2021 will bring dynamic new voices to the global discussion, explore circular opportunities from the perspective of natural resource-producing countries, and highlight the critical importance of the circular economy to fight climate change and to protect biodiversity. Now is the time to make the changes necessary to ensure future prosperity, sustainability, and resilience. WCEF2021 will bring together global leaders and experts to drive ambitious action over the next five years to accelerate the transition to a prosperous, inclusive, and equitable circular economy.