Argument: Some negative externalities from eco-tourism are ok
- Coburn Isaacs. "The limited potential of ecotourism to contribute to wildlife conservation". 2000 - "The existence of negative externalities does not mean that ecotourism is necessarily detrimental. Indeed, ecotourism is likely to be less damaging to the environment than alternative industries like agriculture, mining, timber, and urban development (Poirier 1997)."