2. How has the concentration of CO2 in the atmosphere changed over the past 400,000 years, according to measurements of CO2 in Antarctic ice
cores?

Which factors add to the greenhouse effect and are caused by human activities?

Which of the following is an example of a policy that may be implemented by a business that has trouble with employees using the internet for their own personal needs? a. all employees will have to take a safety training class. b. employees caught using the internet for personal needs will have to take a professional development class. c. personal interviews will be conducted to find out who is using the internet for personal needs. d. employees will be monitored, but nothing will happen if their employer catches them using the internet for personal needs.

Why is oman trying to develop its tourism and manufacturing sectors?