natural gas uranium crude oil coal
I gave my students this multiple choice question: Using nonrenewable resources for energy produces waste products that can have long-term, negative effects on Earth's subsystems. Which energy source produces waste products that can have these effects for the longest amount of time?

Only one answer is correct among these 4 choices:
- natural gas
- uranium
- crude oil
- coal

Could you tell me which one is correct?

uranium