Two villages were focused mostly on mining operation. Brown village extracted fossil fuels such as coal from their mountains, while Yellow village was mostly focused on extracting gold the old fashioned way. Which village has more of an impact on Earth's temperature?
----
Answer: Brown

David was studying human history. He selected two specific eras of human history, era A and era B. Era A was before humans had invented agriculture. And, era B was after the invention of agriculture. He noticed that human societies had changed dramatically after the invention of agriculture. In which era food supply was more dependable, era A or era B?
----
Answer: era B

Berg city used only gas powered vehicles while Hill city used electrical vehicles. The two cities had a similar population and vehicle numbers. Which city had fewer problems with carbon monoxide?
----
Answer:
Hill