11. Ecovillages offer small-scale communities with minimal ecological impact or regenerative impacts as an alternative. 12. The ecological impact of " B . viollaceus " in this region remains unknown. 13. However, the ecological impact causes a net loss to society, 14. Environmental organisations have raised concerns about the ecological impacts on the river's biodiverse ecosystems. 15. "That's one of the reasons the ecological impacts are so severe, " he said. 16. The negative societal impacts described in this section were all caused by negative ecological impacts . 17. The negative ecological impact of such industrial exploitation in the Pechora Sea coast is significant. 18. The scale of the ecological impact may affect the siting and operation of wind turbines. 19. That natural event supplies food for many people but its ecological impact can be devastating. 20. The Koreshans had a major ecological impact on the river when they were living there.
