2. Think of some important renewable resources that you consume directly or indirectly. Do you think the intensity of use of those resources is optimal in the sense of Figure 8.10? Is it less than or more than the optimum (ie, overexploitation)? For resources that seem to be overexploited, how can use be reduced? What are significant practical or social obstacles to reducing the use? Has overexploitation led to irreversible changes in some of the resources?