Moreover, many areas of sustainable development remain technically ambiguous, making it difficult to plan an effective course of action. For example, the forestry industry has had difficulty defining what constitutes sustainable forest management. Some critics believe that simply replacing trees is not enough, because harvesting destroys the biodiversity of the forest. Clearly, more research will be needed to resolve such technical issues. From a broader perspective, however, it is clearly in the interest of business to operate within a healthy environment and economy. It is equally plain that, on a global basis, growing and sustainable economies in the developing countries.