Final answer:
The long-term impact of using nonrenewable energy sources is primarily the release of greenhouse gases, like CO2, from the burning of fossil fuels, contributing to global warming. So the correct option is A.
Step-by-step explanation:
The question asks about the long-term impact of using a nonrenewable energy source. Among the options provided, the most accurate description of the long-term impact is related to fossil fuels, such as coal and petroleum, which when burned release carbon dioxide (CO2) and contribute to global warming. On the other hand, nuclear power, although nonrenewable, does not produce CO2 during operation, but it does create nuclear waste that can be harmful due to radiation if not properly controlled. Geothermal energy, while it can have local environmental impacts, is not a nonrenewable source and therefore does not fit the context of the question focusing on nonrenewable resources. Therefore, the correct answer describing the long-term impact of nonrenewable energy use would be related to the emission of greenhouse gases from the burning of fossil fuels, specifically biomass.