What might be a consequence of gas leakage in tightly sealed spaces?

Gas leakage in tightly sealed spaces can lead to the buildup of odorless gas, which is particularly dangerous. Many gases, such as natural gas, are lighter than air and can accumulate in enclosed areas, leading to a significant risk of explosion or asphyxiation. The lack of ventilation in tightly sealed spaces means that any leaked gas does not disperse and continues to increase in concentration, creating a hazardous environment. Detection is often reliant on odorants added to otherwise odorless gases; thus, in cases where the gas is indeed odorless, the risk increases significantly.

The other consequences indicated do not directly relate to the immediate dangers posed by gas leakage in a sealed environment. Increased temperature isn't necessarily a direct result of gas leakage, nor does gas stratification specifically pertain to the immediate consequence of leakage in such environments. Energy wastage is a broader concept that might occur but doesn't specifically highlight the dangers of gas accumulation in tight spaces.