What issue can arise if gas extraction systems are not properly maintained?

The correct answer addresses a critical concern related to the functionality of gas extraction systems. If these systems are not properly maintained, they can experience reduced efficiency in collecting and managing landfill gases, such as methane. This inefficiency can lead to gas leaking into the atmosphere rather than being captured and treated, posing environmental risks, particularly regarding greenhouse gas emissions. Moreover, leakage can compromise the safety of the landfill site and potentially create hazards for nearby communities.

Proper maintenance of gas extraction systems is essential not only for their efficient operation but also for minimizing unwanted consequences like air pollution and safety hazards. Failure to maintain these systems can result in financial implications related to potential fines for regulatory violations.

In contrast, other options might describe effects that can occur due to different operational issues or site conditions, but they do not directly relate to the consequences of inadequate maintenance of gas extraction systems. For instance, excessive odor could arise from various factors, such as poorly managed waste or other gas management failures, but is not solely tied to maintenance issues. Increased waste volume typically refers to the amount of physical waste being added to the landfill, while enhanced wildlife activity may be influenced by a range of factors including the availability of food sources or habitat rather than the maintenance of gas extraction systems specifically.