Problem: Two brothers owned two adjacent parcels of land. Tom's land was forested, while Bill's was covered with grasslands. Which parcel of land didn't have a rich diversity of large trees?

A: Bill's

Problem: Two sister cities had different environments. Shanghai had big problems with air pollution while Berna took very good care of the surrounding environment and air quality. Which city had air that was not harmful to other living things?

A: Berna

Problem: Thorn county used fossil fuels for their energy needs, while Plant county used nuclear power. They both polluted the environment in different ways. Which county contributed more to global warming?

A: Thorn

Problem: Ben and Harry were studying about the climatic history of Earth. Ben was more attracted to learning about early Ice Ages, while Harry was curious about the Earth atmosphere and read about ozone depletion and its consequences. Which person learned less about the size of the ozone hole over Antarctica?

A:
Ben