Use the ecological footprint data to calculate how many Earths would be needed to meet all human consumption needs of the world's population if all the people on Earth were

a) Americans

Answer: If all people were American, Earths would be needed.

b) Chinese

Answer: If all people were Chinese, Earths would be needed.

c) Qatari.

Answer: If all people were Qatari, Earths would be needed.