Which of the following best describes the long-term impact of using a renewable energy source?

Hydropower involves blocking rivers, which disrupts ecosystems.
Geothermal energy can pollute water supplies.
Nuclear power produces radiation, which is harmful if leaked.
Natural gas causes air pollution when burned.

None of the given options accurately describe the long-term impact of using a renewable energy source. Renewable energy sources such as hydropower, geothermal energy, and natural gas have minimal environmental impacts compared to fossil fuels. They offer cleaner and more sustainable alternatives that help reduce greenhouse gas emissions and mitigate climate change. Nuclear power, on the other hand, is not classified as a renewable energy source, but it does provide a low-carbon energy option.