Assessing cumulative impacts in environmental planning is significant as it evaluates the collective effects of multiple projects or activities on the environment. Such assessments help identify potential risks and interactions that single project evaluations may overlook. By understanding these cumulative impacts, planners can make more informed decisions to mitigate adverse effects on ecosystems and communities. This approach allows for a holistic view of environmental integrity and promotes compliance with regulatory standards. Ultimately, it enhances the sustainability of developments by preserving biodiversity and supporting ecosystem health.