Environmental degradation refers to the negative effects that human activities have on the natural world and its ecosystems. The construction of the second bridge for the bullet train project can have several adverse effects on the environment, including:

• Noise pollution: Construction work produces a significant amount of noise, which can be disruptive to the surrounding neighborhoods and wildlife.
• Air pollution: Heavy machinery used in construction emits emissions, which can pollute the air. This can have a harmful effect on human health as well as on wildlife and vegetation in the surrounding area.
• Water pollution: Construction can cause sedimentation and erosion, which can pollute nearby waterways. This can have a detrimental effect on aquatic life and vegetation.
• Land disturbance: Construction work can cause changes in the landscape, including deforestation, soil erosion, and habitat loss. This can negatively affect the biodiversity of the area.
• Displacement of wildlife: The construction work could displace wildlife from their natural habitats. This can have a significant impact on the local ecosystem as well.

Overall, the construction work for the bullet train project needs to be carefully planned and executed to minimize the adverse effects on the environment and its ecosystems.