In 1999 and 2003, the OCA helped organize protests and teach-ins against the World Trade Organization in Seattle and Cancun. The "Battle of Seattle", as it came to be known, and subsequent mobilizations were the coming of age of the global grassroots.
In 2010, OCA Director Ronnie Cummins and other OCA staff led an escorted delegation to the historic teach-ins and rallies for climate justice and organic agriculture at COP 16 in Cancun, Mexico.
Over 100,000 concerned citizens from North and South America, Europe, Africa and Asia are converge on Cancun, including leading farm, food, Fair Trade, climate justice, and anti-GE activists. Thel attenedd a wide range of workshops, forums, and cultural events. Following up on the theme of the World Social Forum in Porto Alegre, Brazil, "Another World is Possible," the emphasis in Cancun was on presenting solutions and alternatives to the climate crisis.
The OCA delegation partnered with OCA's Mexico sister organization, Via Organica.