Eat together with others regularly, even if you live alone. Take time to observe this most basic way of building community, no matter how hard it is to coordinate schedules.
Take a tour of your house and note all the things you have that come from other places which now belong in yours. Talk about ways that you as a household can express your solidarity with people around the globe, such as buying crafts from artisans in developing countries.
Inform your elected representatives, as well as the leaders of any groups to which you belong, of your support for organizations of international cooperation, such as the United Nations or the World Council of Churches. Your group may also want to look into establishing a local affiliate, or raising money for, one of the private voluntary organizations working internationally, such as Amnesty International, Save the Children, or Care.