* Pollution: Air pollution from vehicles and factories can damage the Opera House's exterior, while water pollution from sewage and stormwater can damage the foundations.
* Vandalism: The Opera House has been the target of vandals on several occasions, who have caused damage to the building's exterior and interior.
* Overcrowding: The Opera House is a popular tourist destination, and can become overcrowded during peak periods. This can put a strain on the building's facilities and cause damage to the interior.
* Climate change: Rising sea levels and storm surges could threaten the Opera House's foundations. Changes in temperature and humidity could also damage the building's exterior.
Natural impacts
* Earthquakes: Sydney is located in a seismically active region, and a major earthquake could cause significant damage to the Opera House.
* Hurricanes: Hurricanes can generate high winds and heavy rain, which could damage the Opera House's exterior and interior.
* Flooding: The Opera House is located on the shores of Sydney Harbour, and is vulnerable to flooding during heavy rains.
* Bushfires: Bushfires can spread quickly and easily in Australia, and could threaten the Opera House if they were to occur nearby.
* Termites: Termites are a destructive insect that can cause significant damage to wooden structures. The Opera House is made of concrete, but it does have some wooden components that could be damaged by termites.