Clear-cutting as a means of timber harvest can have several negative impacts on the environment and ecosystem. Some of the problems associated with clear-cutting include:
1. Loss of biodiversity: Clear-cutting removes entire forests, which can lead to a loss of habitat for many plant and animal species.
2. Soil erosion: Without trees to hold the soil in place, rain and wind can cause significant soil erosion, which can lead to problems like landslides and sedimentation of streams.
3. Water quality: Clear-cutting can negatively impact water quality by increasing sedimentation and runoff.
4. Climate change: Deforestation and clear-cutting can contribute to climate change by reducing the amount of carbon dioxide that is absorbed by trees and increasing greenhouse gas emissions.
Therefore, the statement "clear-cutting has no negative impact on the environment" is incorrect, as clear-cutting can have significant negative impacts on the environment and ecosystem.