What is a potential environmental risk associated with LPG and CNG?

The answer focuses on the environmental risks associated with the use of LPG (Liquefied Petroleum Gas) and CNG (Compressed Natural Gas). The choice highlights the release of greenhouse gases, which is a significant concern with fossil fuel use, including these gas types. When combusted, LPG and CNG can emit carbon dioxide and other greenhouse gases, contributing to climate change and air pollution. The potential hazards to air quality can also arise from emissions that can contribute to smog and respiratory issues, while any accidental releases can contaminate water supplies, highlighting a broader impact on both air and water quality.

Considering the other options, increased soil erosion primarily concerns practices related to land use rather than the usage of LPG and CNG specifically. The statement suggesting no significant risks is inaccurate since all fuel types present potential environmental impacts. Lastly, while reduction of biodiversity may occur through various forms of pollution, it is not a primary concern directly tied to LPG and CNG, particularly in comparison to the acute threat posed by greenhouse gas emissions. Thus, the chosen response effectively encapsulates the key environmental risks linked to LPG and CNG usage.