Action taken on the global/national level may have a greater and broader impact than action taken by communities, because the decision makers are more likely to have the authority to enforce the integrated implementation extensively. At the same time, thus the implementation of high level decisions follows the top-down approach, it will be difficult to get all members of society involved in the process. Decisions on the global/national level may therefore lead to a change in the law, but not necessarily to a change of peoples' attitudes.
Nonetheless, the global/national level is a very important level to implement change, and there are some very promising approaches which need to be more focused on.
how to respond to the [neoliberal economic] globalization?
how to respond to inequality & poverty?
how to respond to climate change?
how to respond to peak oil?