What are the negative effects of glaciation?

Glaciation can have several negative effects, including the alteration of ecosystems, as habitats may be destroyed or transformed due to advancing ice sheets. It can also lead to disruptions in local and global climate patterns, impacting agriculture and water resources. Additionally, glaciation can cause geological hazards, such as landslides and avalanches, when ice melts or retreats. Finally, the rise in sea levels from melting glaciers poses significant risks to coastal communities.