How does the amount of carbon dioxide in the air in alaska today compare to the amount 200 years ago?

Nation of conflicting ethnic groups

Historians are researchers of the past or people who understand the history of people. with this field, they must possess qualities such as being unbiased, patient, efficient reader, has a knack for logic and critical thinking and reasoning, disciplined, open-minded, resourceful, with good analytical ability, good reasoning skills and problem solving!