1. The average annual increase of CO2 between 1958 and 2014 was . 2. The average annual increase of CO2 between 1970 and 1980 was . 3. The average annual increase of CO2 between 2004 and 2014 was . 4. CO2 concentration and rate over time. 5. The most recent CO2 concentration measured is .

The answers to the question are

1). 0.85 ppm

2). 1.28 ppm

3). 2 ppm

4). 1980 CO₂ concentration = 340 ppm

2018 CO₂ concentration = 407.4 ppm

Growth rate = 1.77 ppm per year

5). 407.4 ppm

Explanation:

1  1958 - 2004 = 0.6 ppm = 46 years

2004 - 2014 = 2 ppm = 10 years

Total average = (27.6 +20 )/56 = 0.85 ppm

2. 0.6 ppm

3. 2 ppm

4. CO₂ concentration = 340 ppm in 1980 to about 407.4 ppm in 2018

an increase of about (407.4-340)/(2018-1980) = 1.77 ppm per yer

5. The most recent CO₂ concentration measured is 407 arts per million