There is, however, more substantial support for the Dunlap-Heffernan’s second hypothesis: environmental concern is more strongly associated with involvement in appreciative recreational activities than in consumptive activities. In this area, recreational activities are grouped into two main categories. The first is the “appreciative” type, which includes slight resource-utilization activities (e.g. nature photography, birding, biking, etc.) and is believed to leave little or no impact on the environment. The second category is the “consumptive” type, which includes intensive resource-utilization activities (e.g. hunting, fishing, mechanized or motorized activities, etc.) and is believed to yield more negative impacts on the natural environment compared to the first category [3].