What is a major disadvantage of using fossil fuels?

Using fossil fuels has a significant disadvantage in that they cause air pollution. When fossil fuels such as coal, oil, and natural gas are burned for energy, they release various harmful emissions into the atmosphere. These emissions include carbon dioxide (CO2), sulfur dioxide (SO2), nitrogen oxides (NOx), and particulate matter, contributing to environmental problems like smog, acid rain, and respiratory issues in humans. Additionally, the increase in carbon dioxide levels due to fossil fuel combustion is a major driver of climate change.

In contrast, the other statements do not represent accurate characteristics of fossil fuels. Fossil fuels are non-renewable resources, meaning they cannot be replenished within a human timescale, which is why they can't be considered renewable. Compared to some alternative energy sources, they can also produce a large amount of energy, and although they are widespread, their availability is not unlimited, as they are subject to depletion over time.