Over the next two decades, Green worked internationally, participating in activities that opposed apartheid and concentrated on community development. She took on a leadership role at CUSO, serving as regional coordination of the international development organization. In this role, Green supported projects in east, southern, and central Africa as well as the Caribbean. She remained CUSO coordinator in Grenada until 1983. Green was evacuated from the island nation of Grenada, after it was invaded by the United States following the execution of Prime Minister Maurice Bishop.