Import Restrictions Through its importation of products that are associ- ated with environmentally unsustainable production, the developed world has an indirect but important impact on the global environment. International treaties to limit the destruction of endangered resources will have little effect if wealthy nations continue to provide lucrative markets for the sale of such goods. Import restrictions are an effective way of reducing undesired inter- national trade. Consumer sovereignty expressed through boycotts and other forms of pressure on corporations can be effective. However, they require strong leadership and tend to focus on large firms, which represent only a relatively small portion of the overall problem